Amino acid replacement M26L. This changes the second translation initiation codon from AUG to UUG.
Top3αM26L.EYFP rescues Top3α6
Top3αM26L.EYFP rescues Top3α54
Top3αM26L.T:Avic\GFP-EYFP fully rescues the viability defects of Top3α6 and Top3α54 animals and the rescued animals are fertile.