You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is B cells are processed in and explain in detail?
Ans. a (Bone marrow). (Ref: Ananthnarayan, Microbiology/6th ed., 116)# B lymphocytes precursors, pro-B cells develop in the fetal liver during embryonic life and in bone marrow afterwards continuously throughout life.# Rearrangement of Ig genes takes place on their becoming preB cell, which synthesize cytoplasmic IgM.# T-cell precursors from yolk sac, fetal liver, BM, migrates to thymus during embryonic and post- natal stages.# Earliest identifiable cells of T-lineage and CD7 + pro T cells, on entering thymus became preT cells (immature).# These cells mature in extrathymic tissue and become helper/inducer T-cells, cytotoxic supressor cells.