FlyBase curator comment: this entry is used to capture phenotypic information when the particular allele (or allele combination) used by the author could not be determined but the context of the experiment suggests that the phenotype being described is some kind of loss of function.
cvunspecified is partially rescued by cvtsg.Tag:polyHis
The cvtsg.T:Zzzz\His6 transgene can rescue up to 50% of cvunspecified mutants, depending on the transgenic line.