NBS-class genes amplification model related to gene duplication events in Lotus japonicus.

  The curved lines within inner circle, colored by green, linked paralog pairs on Lotus japonicus 6 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.