“…However, recent studies have revealed that apart from CNL genes, a small group of nTNL genes that possess a special N-terminal domain, RPW8 (resistance to powdery mildew8) domain, likely represent a distinct class of NBS genes (RPW8-NBS-LRR [RNL]; Xiao et al, 2001;Cannon et al, 2004;Bonardi et al, 2011;Collier et al, 2011;Shao et al, 2014;Zhang et al, 2016). Investigations of NBS genes in the Fabaceae (rosid I lineage) and Brassicaceae (rosid II lineage) have shown that RNLs and CNLs diverged prior to the divergence of these two families (Shao et al, 2014;Zhang et al, 2016). Interestingly, although both CNL and RNL genes are present in monocots and dicots, TNL genes only are present in dicots (Meyers et al, 2003;Tarr and Alexander, 2009;Andolfo et al, 2013;Shao et al, 2014).…”