Term: head kidney natural killer cell
Name: head kidney
Synonyms: anterior kidney, kidney marrow
Definition: The zebrafish head kidney consists of fused bilateral lobes located in the anterior part of the kidney. It is analogous to the mammalian bone marrow and the primary site of definitive hematopoiesis.
Ontology: Anatomy Ontology [ZFA:0000669]

Name: natural killer cell
Synonyms: large granular lymphocyte, NK cell, null cell
Definition: A lymphocyte that can spontaneously kill a variety of target cells without prior antigenic activation via germline encoded activation receptors and also regulate immune responses via cytokine release and direct contact with other cells.
Ontology: Anatomy Ontology [ZFA:0009278]