Reptiles and non-human mammals have the same kinds of neurons that humans do

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A note for Lesson no. 1, "You Have One Brain (Not Three)," in Seven and a Half Lessons About the Brain by Lisa Feldman Barrett.
Some context from page 19‌‌‌ is:

Thanks to recent research in molecular genetics, we now know that reptiles and nonhuman mammals have the same kinds of neurons that humans do, even those neurons that create the fabled human neocortex.

The appendix adds:

...the neurons have the same molecular identity—a specific gene or sequence of genes—that perform the same genetic activities (e.g., they make the same proteins).

What is this?

Gee's book [1] is filled with interesting examples on this topic, as is Striedter & Northcutt's book.[2]


References

  1. ↑ Gee, Henry. 2018. Across the Bridge: Understanding the Origin of the Vertebrates. Chicago, IL: University of Chicago Press.
  2. ↑ Striedter, Georg F., and R. Glenn Northcutt. 2020. Brains Through Time: A Natural History of Vertebrates. New York: Oxford University Press.
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