This allele originated in an antimycin A-resistant mouse LA9 cell line contains an insertion/duplication of a C in the CCCCCC sequence at ChrM:13885-13890 followed by a deletion of T at 13891. This is a revertant allele, reverting the frameshift caused by the C insertion/duplication in the mt-Nd6m1Dwa allele carrying parent strain. (J:132659)