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.
rSu(b) is suppressed by su(r)unspecified in a bunspecified background; rSu(b) su(r)unspecified bunspecified flies have an enhanced black body colour and dull red eyes.
su(r)unspecified, tt1 has lethal phenotype