Distribution of Cassava predicted NBS-LRR resistance genes. The relative map position of 205 NBS-LRR genes is shown on each of the 18 cassava chromosomes. Each gene is represented by a colored tick mark. TNL genes are represented by red ticks, while CNL and partial genes are represented by blue and black tick marks, respectively. NBS-LRR clusters are evident on chromosomes 16 and 17. In the center, gene expression densities in healthy cassava leaves (outer histogram) and roots (inner histogram) depict transcriptional activity of the NBS-LRR rich regions. Expression densities were obtained by mapping RNASeq reads to the genome and were plotted using 0.5 Mb windows.