The cyclical periods of growth (anagen), regression (catagen), quiescence (telogen), and shedding (exogen) in the life of a hair; one of the collection or mass of filaments growing from the skin of an animal, and forming a covering for a part of the head or for any part or the whole of the body. [GOC:jl]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process