B. rapa was a paleohexaploidy with three subgenomes which share the same diploid ancestor of the model species A. thaliana. Among these three subgenomes, we observed biased gene fractionation (gene losing). We named the lest fractionized subgenome as LF, the moderate gene fractionized as MF1 and the most gene fractionized as MF2. Here we provided for each A. thaliana orthologous gene, the syntenic paralog in Brassicaceae species.
Cite synteny analysis "Cheng F, Wu J, Fang L and Wang X (2012). Syntenic gene analysis between Brassica rapa and other Brassicaceae species. Front. Plant Sci. 3:198. doi: 10.3389/fpls.2012.00198".