RT Journal Article SR Electronic T1 Polymorphism and protein evolution. The neutral mutation-random drift hypothesis. JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 444 OP 452 DO 10.1136/jmg.8.4.444 VO 8 IS 4 A1 H Harris YR 1971 UL http://jmg.bmj.com/content/8/4/444.abstract AB