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Premature ovarian failure 18
Premature ovarian failure-18 (POF18) is characterized by irregular menstrual cycles and cessation of menstruation in the third decade of life. The uterus is small; ovaries may be small or rudimentary, and do not show follicular activity (Fan et al., 2021). For a general phenotypic description and discussion of genetic heterogeneity of premature ovarian failure, see POF1 (311360). [from OMIM]
Spermatogenic failure 52
Spermatogenic failure-52 (SPGF52) is characterized by azoospermic infertility resulting from meiotic arrest at the spermatocyte stage (Fan et al., 2021). For a discussion of genetic heterogeneity of spermatogenic failure, see SPGF1 (258150). [from OMIM]
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