Table 1 . Summary of cis- and trans-regulations of zein genes.

Zein genes	Cis-elements		Gene expressiona
	P-box	O2 or O2-like box	PbfRNAi	o2	PbfRNAi/−; o2/o2
γ-27	+	+	Reduced	Normal	Reduced
α-22	+	+	Reduced	Reduced	Additive effect
α-19	+	−	Normal	Reduced	Additive effect
γ-16	−	−	Normal	Normal	Normal
β-15	+	+	Normal	Reduced	Reduced
δ-10	−	−	Normal	Reduced	Reduced

^aGene expression in mutants compared to normal background.