Microbiology 9th Edition by Laura Black, Jacquelyn Black

تمرين 39

To become a fully activated, antibody-secreting cell, B cells usually need:
(a) To encounter an antigen or receive a signal delivered by a T helper cell
(b) To ingest a foreign invader such as a microbe
(c) Activation by a plasma cell
(d) Contact with an antigen and T helper cell cytokines