NBS-class genes amplification model related to gene duplication events in Arachis duranensis.

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