Assertion: nucleic acid | /r/HasProperty | different dnas
Facets:
Source sentences:
text: Because about a year or so before Watson and Crick figured out the structure of the double helix there was a guy named Erwin Chargaff in New York at Columbia University who one day figured out that if you looked at a whole bunch of nucleic acids, different DNAs from different cell types -- And in certain cell types what he found was that G was equal to, for example G equals 20% of the bases.