Giant Neurons Existed on Mars as on Earth.

Some people think neurons cannot be as large as 500 micrometers in diameter. In fact, such giant neurons are not rare at all. For example, they exist in Earth’s squids ( Fig. 1, Ref. 1) and in Martian meteorite Tissint (Fig. 2, Ref. 2).
Fig.1: [link to www.wretch.cc]
Source: [link to www.quora.com]

Fig.2: [link to www.wretch.cc]
Source: [link to www.macovich.com]

Ref. 1: [link to en.wikipedia.org]
Ref. 2: [link to www.wretch.cc]