They are trying to customize B cells with proteins specific to certain type of cancer so they can grow T cells in the lab that will attack that cancer.
They carry the basic data for every known hostile microorganism and update your B cells, Doctor?
John Ringo -- Live Free or Die
Brush away fancy titles and B cell was still running things as advised by Mike, backed by a Congress in which we could not lose a test vote—but did lose others we did not want to win, or did not care about.
Robert A. Heinlein -- The Moon is a Harsh Mistress