Saturday, February 28, 1953, as noted in McElheny 2004, pp. 57–59: Watson found the base pairing mechanism which explained Chargaff's rules using his cardboard models.
Subota 28. februar 1953, kao što je navedeno . u McElheny 2004, стр. 57-59: Watson je pronašao mehanizam uparivanja baze koji objašnjava Čargafovo pravilo pomoću svog karton modela.