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Fig. 6. Maize yabby genes are expressed on the adaxial side of incipient
leaf primordia. (A) In situ hybridization with a knotted1
(kn1) specific probe shows expression in the meristematic cells of
the SAM. (B-E) Hybridization of adjacent longitudinal sections with
kn1 (B) and zyb14 (C), or kn1 (D) and zyb9
(E), shows that incipient leaf primordia defined by lack of kn1
expression comprise around six tiers of cells (indicated by arrowheads), and
that zyb9 and zyb14 expression is limited to the adaxial
side.