Phenotypes of mutant seeds examined with Nomarski
optics. Embryo (E) and suspensor (S) cells, enlarged endosperm nucleoli
(arrows), and endosperm cytoplasmic masses (CM) are visible in cleared
mutant seeds from heterozygous siliques at the heart-to-cotyledon
stages of normal development. A, ttn4 embryo; B,
ttn6-1 embryo; C, ttn1-2 embryo; D, wild-type
embryo; E, ttn1-2 endosperm; F, wild-type endosperm. Scale
bar = 30 μm.