TABLE 3.

Conjugation and mobilization frequencies of pRA2 during filter matings

Donor strain	Donor plasmid	Frequency of transfer intoa:
		RA713RifNal	KT2440RifNal
Conjugation
P25X19	pRA19	<1.0 × 10−9	<1.0 × 10−9
P25X14	pRA14	<1.0 × 10−9	<1.0 × 10−9
Mobilizationb
P25X19T	pRA19	2.6 × 10−6	1.0 × 10−7
P25X14T	pRA14	4.6 × 10−6	6.0 × 10−8

^aFrequencies of transfer are given as the number of transconjugants per donor CFU. 

^bPlasmid RK2/RP4 was introduced into strains prior to mating to provide Tra functions in trans.