While it is known that plant ATase is sensitive to feedback regulation (Ito et al., 1994) the impact of this inhibition on plant cellular metabolism has not been examined thoroughly. Isolation of cDNAs derived from two Arabidopsis ATase genes (Genbank accessions D28868 and D28869) of similar sequence by Ito and colleagues (1994) should be helpful in clarifying the activity and regulation of this enzyme.