Figure 1.

Alignment of small subunits and created mutations. A, Position of the first amino acid shown is given in parentheses following the small subunit origin. Sequence numbering is based on the maize endosperm small subunit. Maize and barley endosperm are heat sensitive while maize embryo, maize leaf, and potato tuber are heat stable. Amino acids examined here are in bold and boxed. Shaded areas indicated highly conserved amino acids. B, Changes in the N termini of the various mutants are listed. Inserted amino acids are in bold.