Consensus spacer sequences of varying length with ACGT elements flanking them. The first nucleotide for each spacer shows a clear preference for G (red), whereas the terminal nucleotide shows the conservation of C (green). Spacer length 24 is observed to be conserved to a greater extent, as compared to other spacer lengths (blue). A Adenine; T Thymine; G Guanine; C, Cytosine; S Guanine/Cytosine; N None of the bases met threshold requirements (A/T/G/C).
Mehrotra et al. BMC Genomics 2013 14:203 doi:10.1186/1471-2164-14-203