A<unk>  (also known as a<unk> ocyte or a labrocyte) is a resident<unk>  of connective tissue that contains many granules rich in histamine and heparin. Specifically, it is a type of granulocyte derived from the myeloid stem<unk>  that is a part of the immune and neuroimmune systems.<unk> s were discovered by Paul Ehrlich in 1877. Although best known for their role in allergy and anaphylaxis,<unk> s play an important protective role as well, being intimately involved in wound healing, angiogenesis, immune tolerance, defense against pathogens, and vascular permeability in brain tumours. The<unk>  is very similar in both appearance and function to the basophil, another type of white blood<unk> . Although<unk> s were once thought to be tissue-resident basophils, it has been shown that the two<unk> s develop from different hematopoietic lineages and thus cannot be the same<unk> s.
Mast cell
T cell
Reactive lymphocyte
Dendritic cell
Natural killer cell
Prolymphocyte
Nonspecific immune cell
Basophil