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    Wallace, S., Chater, C. C., Kamisugi, Y., Cuming, A. C., Wellman, C. H., Beerling, D. J., & Fleming, A. J. (2015). conservation of Male Sterility 2 function during spore and pollen wall development supports an evolutionarily early recruitment of a core component in the sporopollenin biosynthetic pathway. New phytologist, 205(1), 390–401. http://access.bl.uk/ark:/81055/vdc_100025101346.0x00004f