Separable from: P{lacW}GclmL0580. The lethality of the "l(3)L0580" chromosome (caused by l(3)L0580L0580) is separable from the P{lacW}GclmL0580 insertion, as judged by failure to recover dysgenically induced revertants, failure to rescue the lethality using a Gclm transgene and by deficiency mapping.