Hello Sweta,
Thank you for using the UCSC Genome Browser and your inquiry.
These identifiers were removed from RefSeq as they have become obsolete due to insufficient evidence and is the reason that you are unable to find these identifiers. For example, searching for the NM_033548.1 identifier at NCBI, you can get more information about the identifier.
From the NCBI search result, the following information is displayed:
NM_033548.1 was permanently suppressed because currently there is insufficient support for the transcript and the protein.
I hope this is helpful. If you have any further questions, please reply to gen...@soe.ucsc.edu.
All messages sent to that address are archived on a publicly-accessible Google Groups forum.
If your question includes sensitive data, you may send it instead to genom...@soe.ucsc.edu.
Jairo Navarro
UCSC Genomics Institute
Want to share the Browser with colleagues?
Host a workshop: http://bit.ly/ucscTraining
Sweta
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