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Test for cross-feeding of Arg-auxotrophic strain SK2226/pBR329 by the following strains: argR/vector, GJ4748/pBR329; argR/argPd, GJ4748/pHYD953; argR/m.c. (multicopy) yggA+, GJ4748/pHYD952; and argR yggA/argPd, GJ4894/pHYD953. Cross-feeding was scored after 12 h of incubation.
