Folding fact #145
1950 Erwin Chargaff found that in DNA the amounts of adenine and thymine are about the same, as are the amounts of guanine and cytosine. These relationships are later known as "Chargaff's Rules" and serve as a key principle for Watson and Crick in assessing various models for the structure of DNA.
Earle and Enders studied monkey, mouse, and chick cells in cell cultures.
Artificial insemination of livestock using frozen semen, a long-time dream of farmers, was successfully accomplished.