Evaluation of a program for preventing adolescent pregnancy
Gordis, L.; Finkelstein, R.; Fassett, J.D.; Wright, B.
New England Journal of Medicine 282(19): 1078-1081
1970
ISSN/ISBN: 0028-4793 PMID: 5438428 DOI: 10.1056/nejm197005072821906Document Number: 469620
T-even bacteriophage capsid proteins were separated on 6% agarose columns by use of 6 m guanidine hydrochloride containing 5 mm dithiothreitol both to dissociate and to elute the proteins. The head capsids of T2H, T4B, T4B01, T4D, and T6r(+) contained at least three structural proteins with molecular weights of 40,000, 18,000, and 11,000 daltons, amounting to 76, 2, and 8%, respectively, of the total capsid protein. On the other hand, T2L head capsids contained only two structural proteins with molecular weights of 40,000 and 18,000 daltons (81 and 2.5%, respectively, of the total protein). A discussion of the possible role of these structural head proteins and a T-even phage head model suggesting a structural arrangement of the 40,000 dalton subunit are presented.