NBS-domains genes amplification model related to gene duplication events in Vitis vinifera .

  The curved lines within inner circle, colored by green, linked paralog pairs on Vitis vinifera 19 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.