Extended Data Fig. 1: Overview of protophloem development.
From: A molecular rheostat adjusts auxin flux to promote root protophloem differentiation
a, Illustration of protophloem development from the stem cell to the mature sieve element in the Arabidopsis root meristem. b, Illustration of a cross section through the stele of an Arabidopsis root meristem, highlighting the arrangement of the two sieve element strands and the xylem axis.
