The shoot apical meristem of a developing embryo
a)Matures early (~globular stage) in embryogenesis, at the site
of an auxin maxima
b)Matures early (~globular stage) in embryogenesis, at the site
of an auxin minima
c)Matures late (~late heart stage) in embryogenesis, at the site
of an auxin maxima
d)Matures late (~late heart stage) in embryogenesis, at the site
of an auxin minima