Contains sqh, expressed under its own promoter and containing the amino acid replacements S1A, S2A, T5A, T11A and T12A.
Early embryos that express sqh5XA show no difference in the cortical myosin cycle to wild-type embryos.
sqh5XA rescues sqhAX3
A single copy of sqh5XA is sufficient to fully rescue the null sqhAX3 mutation.