Contained within a 12.3kb genomic HindIII fragment.
wild-type
Flies carrying Csp+t12.3 do not have a crumpled wing phenotype and the eyes are normal.
Csp+t12.3 rescues Cspunspecified
Csp+t12.3 rescues CspR1
Csp+t12.3 rescues CspX1
Both the lethality and the early adult death of CspR1 and CspX1 are rescued by Csp+t12.3.