NBS-class 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-class subfamily genes with darkblue (NBS-CC) and darkorange (NBS-TIR). Colored curved lines linked nodulation gene pairs with Ks < 0.15.