In their work, Haydock et al. identified the sequence RXR(X)5YASH (the first Arg corresponds to R190 of E. coli FabD, Table 3) for methylmalonyl-CoA specific ATs, and MXW(X)5YASH for methoxymalonyl-ACP specific ATs within the concanamycin PKS. Here, MCAT is linked to tetrasomy 12p.