C57BL/6, oo inta badan loo yaqaan "C57 black 6", "C57", ama "black 6" (soo gaabinta heerka B6), waa nooc ka mid ah jiirka shaybaadhka ee caadiga ah. Waxaa si ballaaran loo isticmaalaa sida jiirka transgenic ee baaritaanka hidda-socodka si loogu ekaado cilladaha hidde-socodka aadanaha.
Shirkadani waxa ay haysaa wax badan oo diyaarsan-ikhtiraacyo la sameeyay oo ay ku dooran karto waxa kale oo ay samayn kartaa barnaamij cusub iyada oo loo eegayo baahidayada, kaas oo aad u fiican si loo daboolo baahiyahayaga.