Are homeobox knotted-like genes and cytokinins the leaf architects?

An increasing body of evidence indicates that the products of homeobox genes control the expression of specific target genes that trigger important differentiation processes in a variety of organisms ([Gehring, 1987][1]; [Skott et al., 1989][2]; [Kessel and Gruss, 1990][3]; Kerstelter et al., 1994