Fails to rescue the dominant lethality of the '18242DL', '32322DL', '9916DL' or '22622DL' chromosomes (in which the wupA, l(1)16Fe and l(1)16Fm genes are inactivated by a mutation in the 'dominant lethal' domain of 16F). Fails to rescue the semidominant lethality of wupA24597 or wupA8384.