If a stem cell no longer make the transcription factor PU.1, the stem cells cannot develop into ____________________.

This complement protein is cleaved to become activated to cleave C4 in the classical pathway of complement activation.

These effector cells release antibodies.

These immune cells release histamine during inflammation and play a role in allergies..

New lymphocytes need to be check to be sure they do not recognize self in a process known as ___________________. 

The inflammasome activates a caspase that cleaves the inactive forms of this cytokine.

To separate helper T cells from other immune cells using flow cytometry, which approach would be best.

_________________________ is an example of an opsonin.

All immune cells originate from this type of stem cell.

The alternative pathway of complement activation begins when ________.