Origin of The Term
The abbreviation "B" in B cell originally came from Bursa of Fabricius, an organ in birds in which avian B cells mature. When it was discovered that in most mammals immature B cells are formed in bone marrow, the word B cell continued to be used, although other blood cells also originate from pluripotent stem cells in the bone marrow. The fact that bone and bursa both start with the letter 'B' is a coincidence.
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