Larval Malpighian tubes pale yellow, distinguishable from wild type.
Eye color autonomous when larval optic disk is transplanted into wild-type host.
Eye colour: dark maroon to sepia-like with age; less extreme than se. RK1.
cl1 is rescued by Scer\GAL4unspecified/clUAS.cGa
Severely deficient in one of three enzyme activities required for the conversion of dihydroneopterin triphosphate to pyrimidodiazepine, a precursor of the drosopterins (FBrf0041211). Claimed to accumulate 2-amino-4-hydroxypteridine, biopterin, sepiapterin and xanthopterin (FBrf0023460).