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B cells according to the book but cat
Note that it just means that the mature B cell “splits off” into the two B cell type, cuz yk, Memory is a Memory B cell ig,, (they are still different breeds of cat)
uuuhh I like to think they get a new collar based on their “phase” of course, it’s a B (in their colour), but on the actual collar part, it shows the first letter of their “phase” (Progenitor has P, immature has I and M, and mature has an M)