Assertion: immune system's cell | /r/HasProperty | scavenger
Facets:
Source sentences:
text: Macrophages: These cells are referred to as scavengers, as they pick up and ingest foreign substances and then present them to T-cells and B-cells of the immune system.
text: NK cells were first recognized in 1975, when researchers observed cells in the blood and lymphoid tissues that were neither the scavengers described above nor ordinary lymphocytes but which nevertheless were capable of killing cells.