Excision of the progenitor insertion, removing the 5'UTR flanking the insertion site, the start methionine, and 914 bp of the mrva ORF.
977bp deletion resulting from the imprecise excision of P{EP}mrvaEP3102 that removes the 5'UTR flanking the insertion site, the start methionine, and 914 bp of the mrva ORF.