..., optomotor-blind ( omb ) and brinker ( brk ),collaborate to initiate formation of the fifth longitudinal (L5) wing vein. omb is broadly expressed at the center of the wing disc in a pattern complementary to that of brk , which is expressed in the lateral regions of the disc and represses omb expression. We...

... that accommodates our results is that X forms a monotonic gradient extending from the back of the A compartment to the front of the P compartment in the next segment, a unit constituting a parasegment. We present evidence that the P compartment is patterned by another morphogen that acts also through omb – omb...