Affects CO2 fixation; green seedling. Like hcf4 (Miles 1982); slightly yellow-green seedling (Leto and Miles 1977). TB-1La uncovers (Leto and Miles 1977, 1979; Leto 1982; Miles et al. 1985). (Polacco). Genetic 2005 1 coordinates determined from these recombination and map data: hcf13 TB-1La-4L4692 [source of data unclear]; TB-1La(1) hcf13; see MaizeGDB ID:108141; 104671. This gene was originally curated in MaizeGDB Database and the map position was displayed on the maize bins map if feasible.