Plasma cells are activated b cells that secrete antibodies.
Plasma cells plasma cells plasma cells are the mature form of b-lymphocytes.
Mature forms of b-lymphocytes secrete antibodies.
The mature form of what kind of cell secretes antibodies?

  more abundant
  it needs them
  positive
  graptolites
  A Greek letter
  barnacles
  B-lymphocytes
  homogenous