(TFB1), the homologue of BTF2 . Yeast DOS2 protein, involved in single-copy DNA replication and ubiquitination . Drosophila synapse-associated protein SAP47. Mammalian SYAP1 . Various Arabidopsis thaliana (Mouse-ear cress) hypothetical proteins. [ edit ] References ^ a b Doerks T, Huber S, Buchner E, Bork P (April 2002). "BSD: a novel