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Cells of wild-type and mutant R. marinus strains. (A) Strain SB-51 (ΔpurA ΔtrpB::purA). The dark color is associated with the Ade− phenotype; it appears that the cointegrate is being resolved. Stable Ade− derivatives, including SB-62 (ΔtrpB ΔpurA) were isolated from the dark colony segments. (B) PRI-493 (wild type). (C) The colorless strain SB-71 (ΔtrpB ΔpurA crtBI′::trpB).
