In the micrographs I found numerous branching blood vessel remains,
marked in the following figures:
http://www.wretch.cc/album/show.php?i=lin440315&b=30&f=1044128806&p=0
http://www.wretch.cc/album/show.php?i=lin440315&b=30&f=1044128808&p=1
http://www.wretch.cc/album/show.php?i=lin440315&b=30&f=1044128810&p=2
A list of my posts http://www.wretch.cc/blog/lin440315&category_id=0