NBS-domains genes amplification model related to gene duplication events in Phaseolus vulgaris.

  The curved lines within inner circle, colored by green, linked paralog pairs on Phaseolus vulgaris 11 chromosomes produced by CEH (c). NBS-domains subfamily genes with darkgreen (NBS-TNL), crimson (NBS-TNx), darkorange" (NBS-xNL) and navy (NBS-xNx). Colored curved lines linked nodulation gene pairs with Ks < 0.15.