By Kasper van Gelderen and colleagues. Molecular Plant 9(6), 857–869 (6 June 2016), DOI doi.org/10.1016/j.molp.2016.03.005
Abstract and Introduction, p. 857: separation versus lignified layers, early ind-mutant cell-division defect, auxin response and tissue-targeted PID/WAG2 expression during stages 14–16. Distinguish early specification from the previously reported late auxin minimum.