Hedges R W
J Gen Microbiol. 1975 Apr;87(2):301-11. doi: 10.1099/00221287-87-2-301.
Eighty-nine R factors were transmitted by conjugation to Escherichia coli K12 from isolates of Proteus hauseri (P. mirabilis plus P vulgaris). More than half were non-selftranmissible. The remainder included plasmids assigned to the previously defined groups FII,A-C complex, J, N and P, as well as some not belonging to any knwon compatibility groups. R factors from strains isolated in India, Thailand and Japan carried plasmids whose inheritance was extremely unstable in E. coli K12. All belonged to a new compatibility group, V.
89个R因子通过接合作用从豪氏变形杆菌（奇异变形杆菌加普通变形杆菌）的分离株转移至大肠杆菌K12。其中一半以上是非自我传递的。其余的包括属于先前定义的FII、A - C复合体、J、N和P组的质粒，以及一些不属于任何已知相容群的质粒。从印度、泰国和日本分离的菌株中的R因子携带的质粒在大肠杆菌K12中的遗传极其不稳定。所有这些都属于一个新的相容群，V群。
