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.
Shirkaddani waxa ay si fiican u dabooli kartaa baahidayada xagga tirada alaabta iyo wakhtiga keenista, markaa waxaanu had iyo jeer dooranaa marka aanu haysano shuruudaha wax soo iibsiga.
Tayada alaabadu waa mid aad u wanaagsan, gaar ahaan faahfaahinta, waxaa la arki karaa in shirkadu ay si firfircoon u shaqeyso si ay u qanciso xiisaha macaamiisha, alaab-qeybiye fiican.