NBS-domains genes amplification model related to gene duplication events in Arachis ipaensis.

  The curved lines within inner circle, colored by green, linked paralog pairs on Arachis ipaensis 10 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.