Introduction. Yersinia enterocolitica (Ye) species is divided into 6 biotypes (BT). 1A. 1B. https://www.spidertattooz.com/Messerschmitt-Me262A-1A-Fighter-Aircraft-LT-Walter-Hagenah-III-Jagdeschwader-7-Larz-Airfield-Germany-1945-German-Luft/