Deletion derivative of the P{Ins1a} insertion. The core sequences are not present between functional P-element ends and lie adjacent to genomic sequences.
Deletion of the right terminal repeat and part of the core sequences of P{Ins1a}. The core sequences are not present between functional P-element ends and lie adjacent to genomic sequences.
Deletion derivative of P{Ins1a} slightly stimulates Zw gene activity, Ins2 has no effect.
Low activity.