The following micrograph is marked for many indisputable Martian blood
vessel remains found in meteorite SAU008, which,according to NASA, is
a shergottite originating from Mars :
http://www.wretch.cc/album/show.php?i=lin440315&b=29&f=1782807411&p=55

The micrograph shows blood vessels that tapered, branched, curved and
contained red blood cells. No mineral fibers or geologic cracks or
bioturbation burrows resemble these Martian blood vessel remains.

Image Source: Tom Phillips' gallery at
http://www.meteorite.com/meteorite-gallery/meteorites-alpha_frame.htm
(It is the 5th photo in the micrograph collection there of meteorite
SaU 008).

More indisputable blood vessel remains in meteorites:
http://wretchfossil.blogspot.com/2011/09/indisputable-blood-vessels-in-meteorite.html

http://wretchfossil.blogspot.com/2011/09/indisputable-blood-vessel-remains-in.html

A list of my articles is at http://www.wretch.cc/blog/lin440315&category_id=0