Journal of Bacteriology
Gene recombination between strains of N. asteroides of diverse origins has been demonstrated. In particular pairwise combinations, recombinants made up 0.01% of the population. All nine selectable recombinant classes were recovered from a cross between KK4-47 his-10 leu-1 and KK6-119 met-3 phe-3. Recombinants with an auxotrophic marker from each parent constituted 21% of the recombinants.
Kasweck, K. L., & Little, M. L. (1982). Genetic recombination in nocardia asteroides. Journal of Bacteriology, 149(1), 403-406.