Additional file 11: Figure S8. Primer design for PCR amplification of the CRISPR array from X. citri pv. citri. A, amplification of the full-length CRISPR arrays using primers Leader_fw and Terminator_rev. B, amplification to internal regions of the CRISPR arrays using spacer-specific primers. Forward primers are shown as red rectangles with an arrow, reverse primers are represented by blue rectangles with an arrow.