The lineage-specific marker for B cells is: (A) CD 19, (B) CD 20, (C) CD 21, (D) CD 22
Answer is A. Lineage-specific B cell marker is CD 19. However, on IHC the best marker is CD 20. CD 21 is the receptor for EBV. Ref: Ananthanarayana textbook of Microbiology 9th edition Pgno : 136