According to NASA's scale bar and anatomy, many large lymph noderemains have been discovered by Phoenix Lander on Mars.

According to NASA’s scale bar and anatomy, many large lymph node
remains have been discovered by Phoenix Lander on Mars.
Fig. 1 below links to a Phoenix photo labeled with lymph node remains
of 8,500 microns and 17,000 microns in their long diameters. Their
sizes suggest those remains could be those of humans, as human lymph
nodes range from 1,000 microns to 20,000 microns in diameter (Ref.
1).

Fig. 1: Labeled photo with scale bar made by NASA
http://www.wretch.cc/album/show.php?...1555138028&p=0

Fig. 2: NASA’s original photo: http://phoenix.lpl.arizona.edu/image...ID=6936&cID=89

Fig. 3: Illustration of a lymph node and lymphatic system
http://www.wretch.cc/album/show.php?...1555138026&p=5

Fig. 4: Low power micrograph of human lymphoid tissue with cells
resembling many cell remains found by Phoenix:
http://www.wretch.cc/album/show.php?...1555138025&p=3
Fig. 5: High resolution micrograph of human lymphoid tissue with cells
resembling those found by Phoenix
http://www.wretch.cc/album/show.php?...1555138033&p=2
Fig. 6: Another Phoenix photo labeled with Martian lymph node of 3,500
microns in diameter
http://www.wretch.cc/album/show.php?...1555138030&p=4
Ref. 1: http://en.wikipedia.org/wiki/Lymph_node