part of part of anagen hair growth The growth phase of the hair cycle. Lasts, for example, about 3 to 6 years for human scalp hair. biological_process GO:0042640 Note that this term should not be used for direct annotation. If you are trying to make an annotation to x phase, it is likely that the correct annotation is 'regulation of x/y phase transition' or to a process which occurs during the reported phase. To capture the phase when a specific location or process is observed, the phase term can be used in an annotation extension (PMID:24885854) applied to a cellular component term (with the relation exists_during) or a biological process term (with the relation happens_during). hair cycle phase hair follicle maturation