>"While I am usually sceptical of anything that has even a whiff of human exceptionalism, this is a fascinating result...the primary outstanding question that I have is whether we have actually sampled the population in L1 sufficiently in other species."

What do you mean by "sufficiently"? Did they check in any animals? Did they provide a list of criteria that, if met, allow definite identification of these cells in an animal? Can you quote these parts of the paper?