Deletion of sequences encoding sns amino acid residues 1113-1163 and 1233-1278.
The myoblast fusion defects of snsXB3/snsZF1.4 embryos are not rescued by expression of snsΔΔ1113-1163.1233-1278.Scer\UAS.T:Ivir\HA1 under the control of Scer\GAL4Mef2.PR.