sbe2a shares high nucleotide sequence homology with sbe2 and the two genes encode isomers, starch branching enzymes IIa and IIb, respectively (Gao et al., 1997. Plant Physiol. 114:69-78). Map position from SSR umc1997. This gene was originally curated in MaizeGDB Database and the map position was displayed on the maize bins map if feasible.