Assertion: lymph node's macrophage | /r/HasProperty | crucial
Facets:
value: for antigen presentation
type: PURPOSE
Source sentences:
text: The spleen contains specialized macrophages and dendritic cells that are crucial for antigen presentation, a mechanism critical for activation of T lymphocytes and B lymphocytes (see Major Histocompatibility Complexes and Antigen-Presenting Cells).