Sticks
The Frass Meteorite contains several items best described as "sticks." These appear to made much like terrestrial trees, in that they seem to be made of cellulose and they have multiple layers. Stick like objects have shown up in Spirit Sol 57 microscopic photos.
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Microscopic Imager Non-linearized Full frame EDR acquired on Sol 59 of
Spirit's mission to Gusev Crater at approximately at approximately 10:46:56 Mars
local solar time, Microscopic Imager dust cover commanded to be OPEN.
NASA/JPL/Cornell/USGS
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Here is the position of the microscope at about the same time

Left Front Hazard Camera Non-linearized Downsampled EDR acquired on Sol 59 of
Spirit's mission to Gusev Crater at approximately 10:49:18 Mars local solar
time. NASA/JPL
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And, of course, we must show something similar from the Frass Meteorite.

On the day I first looked at the contents of the meteorite under a microscope, this was the first object I saw. From that moment on, I thought the evidence strong that life exists on Mars.