Ultrastructural characterization of exine development of the transient defective exine 1 mutant suggests the existence of a factor involved in constructing reticulate exine architecture from sporopollenin aggregates.
Ariizumi T, Kawanabe T, Hatakeyama K, Sato S, Kato T, Tabata S, Toriyama K. Plant Cell Physiol. 2008 Jan; 49(1):58-67. Epub 2007 Nov 28.