Abstract Background CABYR is a polymorphic calcium-binding protein of the sperm fibrous sheath (FS) which gene contains two coding regions (CR-A and CR-B) and is tyrosine as well as serine/threonine phosphorylated during in vitro sperm capacitation. Thus far. the detailed information on CABYR protein expression in mouse spermatogenesis is lacking. Moreover. https://balboasurfandsstylers.shop/product-category/sea-glass-rings/