The First Black 6: C57BL/6J
The First Black 6: C57BL/6J
The black 6 mouse, above, was developed around 1920 by Clarence Cook Little (1881-1971), below. Credit: COURTESY OF THE JACKSON LABORATORY ARCHIVES" />The black 6 mouse, above, was developed around 1920 by Clarence Cook Little (1881-1971), below. Credit: COURTESY OF THE JACKSON LABORATORY ARCHIVES As a boy, Clarence Cook Little kept mice as pets, but his hobby became serious inquiry when he began studying Mendelian inheritance of mouse coat color under William Castle at Harvard Univer