This is a Message Board Post that is gatewayed to this mailing list. Classification: Query Message Board URL: http://boards.ancestry.com/mbexec/msg/an/HBRBAIB/1195.1.1.1.1.1 Message Board Post: Hello Bruce, Thank you for that explanation! I studied more chemistry in collage. But did have some of the biochemistry known at that time. DNA was tought but only in it's relationship to protine. Celina