Re: Skb Shotgun Serial Number Identification
Jasmine Miele
Table of Contents Title 18.2. Crimes and Offenses Generally Chapter 7. Crimes Involving Health and Safety Article 7. Other Illegal Weapons 18.2-311.1. Removing, altering, etc., serial number or other identification on firearm
Any person, firm, association or corporation who or which intentionally removes, defaces, alters, changes, destroys or obliterates in any manner or way or who or which causes to be removed, defaced, altered, changed, destroyed or obliterated in any manner or way the name of the maker, model, manufacturer's or serial number, or any other mark or identification on any pistol, shotgun, rifle, machine gun or any other firearm shall be guilty of a Class 1 misdemeanor.
Prior to Final Rule 2021R-05F, licensed manufacturers and importers were required to identify each firearm they manufactured or imported by placing a serial number on the frame or receiver. In addition to the serial number, licensed manufacturers and importers were required to place the following markings on firearm: model (if designated), caliber or gauge, name of manufacturer or importer, city and state, and the name and country of the foreign manufacturer (when applicable). These additional markings could be placed on either the frame, receiver, or the barrel.
Under Final Rule 2021R-05F, licensed manufacturers and importers are now required to identify each new firearm* (manufactured or imported) by placement of the serial number, name of licensee, and city and state of their place of business, on the frame or receiver in accordance with the regulations. These markings may no longer be placed on the barrel or pistol slide. The remaining identification marks (model, caliber or gauge, foreign manufacturer, and country of manufacture (if applicable)) may continue to be placed on the frame or receiver, barrel, or pistol slide.
It should be noted that Final Rule 2021R-05F allows manufacturers and importers to continue to mark existing firearm designs in the same manner as they did before the effective date of the Final Rule. Nearly all firearms that ATF classified - prior to issuance of the Final Rule - are grandfathered and may continue to be marked in the same manner as before the effective date of Final Rule 2021R-05F.
The most common reason for a firearm trace to fail is an invalid or incomplete firearm description. It is essential to note all visible markings on the recovered firearm and to include that information in the trace request. It is possible that a firearm may have difficult to identify markings or after-market modifications, making accurate firearms identification challenging. Please do not hesitate to contact ATF for assistance in properly identifying a recovered firearm.
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Identification of proteins which initiate and/or perpetuate adaptive immune responses has potential to greatly impact pre-clinical and clinical work across numerous fields. To date, however, the methodologies available to identify antigens responsible for driving adaptive immune responses have been plagued by numerous issues which have drastically limited their widespread adoption. Therefore, in this study, we sought to optimize a shotgun immunoproteomics approach to alleviate these persistent issues and create a high-throughput, quantitative methodology for antigen identification. Three individual components of a previously published approach, namely the protein extraction, antigen elution, and LC-MS/MS analysis steps, were optimized in a systematic manner. These studies determined that preparation of protein extracts using a one-step tissue disruption method in immunoprecipitation (IP) buffer, eluting antigens from affinity chromatography columns with 1% trifluoroacetic acid (TFA), and TMT-labeling & multiplexing equal volumes of eluted samples for LC-MS/MS analysis, resulted in quantitative longitudinal antigen identification, with reduced variability between replicates and increased total number of antigens identified. This optimized pipeline provides a multiplexed, highly reproducible, and fully quantitative approach to antigen identification which is broadly applicable to determine the role of antigenic proteins in inciting (i.e., primary antigens) and perpetuating (i.e., secondary antigens) a wide range of diseases. SIGNIFICANCE: Using a systematic, hypothesis-driven approach, we identified potential improvements for three individual steps of a previously published approach for antigen-identification. Optimization of each step created a methodology which resolved many of the persistent issues associated with previous antigen identification approaches. The optimized high-throughput shotgun immunoproteomics approach described herein identifies more than five times as many unique antigens as the previously published method, greatly reduces protocol cost and mass spectrometry time per experiment, minimizes both inter- and intra-experimental variability, and ensures each experiment is fully quantitative. Ultimately, this optimized antigen identification approach has the potential to facilitate novel antigen identification studies, allowing evaluation of the adaptive immune response in a longitudinal manner and encourage innovations in a wide array of fields.
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Fuchs endothelial corneal dystrophy (FECD) is a progressive, bilateral, and often inherited corneal endothelial disease1,2,3. The prevalence of FECD is approximately 4% over the age of 40 in the U.S.4, and 40% of corneal transplantations conducted worldwide are performed to treat FECD5. In the early stage, deposition of extracellular matrix (ECM) forms excrescences, called guttae, at the anterior chamber side of Descemet's membrane (DM)6. In the middle to advanced stage, the guttae increase, become confluent, and finally are partially covered with collagenous fibers associated with the loss of excrescence morphology4,7. During the progression of the disease, the corneal endothelium is continuously damaged, resulting in a decrease in cell density1,2,3,4,7.
Guttae are the clinical hallmark of FECD; indeed, the gold standard of FECD diagnosis is the identification of guttae by slit-lamp microscopy8. Guttae also induce high-order aberrations (HOAs) and light scattering, resulting in visual disturbance9,10. We previously proposed that the overproduction of ECM, which forms the guttae, induces corneal endothelial cell death by the unfolded protein response11,12. Despite the importance of guttae in vision and in the diagnosis and pathophysiology of FECD, many questions remain, such as the components of the guttae, the mechanism of formation of the excrescence morphology, and why guttae initiate at the corneal center and spread to the periphery. Guttae are composed of enormous molecules, but only some components, including fibronectin, type 1 collagen, type 4 collagen, type 8 collagen, laminin, and TGFBI, have been identified13,14. To our knowledge, a comprehensive analysis of the components of guttae has not yet been performed.
The progression of guttae in FECD is thought to involve pathological corneal endothelial cells, as endothelial cells are the only cells close to the DM and guttae. Therefore, one potential method for determining the components of guttae is transcriptome analysis of corneal endothelial cells. Chu and colleagues demonstrated the upregulation of multiple ECM-related genes and showed the activation of the fibrosis pathway by conducting an Ingenuity Pathway Analysis (IPA)15. Consistently, we found that ECM molecules, such as biglycan (BGN), chitinase 3 like 1 (CHI3L1), collagen type VI alpha 2 chain (COL6A2), fibronectin 1 (FN1), and matrilin 3 (MATN3), showed significantly higher expression in the corneal endothelial cells of patients with FECD than in non-FECD control subjects16. However, the expression levels of mRNA and protein do not always correlate, due to post-transcriptional regulation and alternative splicing. In addition, upregulated ECM genes in corneal endothelial cells only indirectly suggest that these molecules are potential components of guttae.
In the current study, we conducted shotgun proteomics of the DM, including guttae, to obtain a comprehensive identification of proteins upregulated in FECD. A further validation study was performed by immunofluorescence staining of DMs obtained from patients with FECD. We also evaluated the feasibility of using matrix-assisted laser desorption ionization imaging mass spectrometry (MALDI-IMS) to characterize the in situ spatial distribution of biomolecules in the DM.
Guttae reduce vision due to increases in HOAs and light scattering9,10, and they are important clinical findings that are used by physicians to decide the timing of surgical intervention (Fig. 1A). Our representative retrocorneal illumination images obtained by a modified ophthalmology slit-lamp microscope showed that the guttae in patients with FECD exhibit a confluent area at the corneal center, surrounded by a less confluent area at the mid-periphery (Fig. 1B). Insertion of the magnified image of the mid-periphery area revealed the morphology of the excrescences. By contrast, no guttae were observed in the non-FECD control subject. Likewise, flat-mounted DMs showed that guttae exhibited sporadic pattern with excrescence morphology in the FECD subject (Fig. 1C, middle), but the DM was homogenous, without guttae, in the non-FECD subject (Fig. 1C, left). In the advanced stage of FECD, the guttae became larger and fused, and individual guttae became difficult to distinguish (Fig. 1C, right).
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