1. Arabidopsis Embryogenesis: Radicle development(s)
Peter Doerner 
Current Biology 
Volume 5, Issue 2, Pages (February 1995)
DOI: /S (95)

2. Figure 1
Progressive stages in the development of the embryonic root in Arabidopsis. Tiers derived from globular stage cleavages are: ut, upper tier; ult, upper lower tier; llt, lower lower tier; hyp, hypophyseal. Formative divisions are indicated in red, and the red arrows indicate the direction of their progression.
Current Biology 1995 5, DOI: ( /S (95) )