Proteins in this family include protein DA1 and its homologues. In Arabidopsis thaliana, DA1 is an ubiquitin receptor that limits final seed and organ size by restricting the period of cell proliferation. It may act maternally to control seed mass [1].

1: Control of final seed and organ size by the DA1 gene family in Arabidopsis thaliana. Li Y, Zheng L, Corke F, Smith C, Bevan MW; Genes Dev. 2008;22:1331-1336. PMID:18483219