3   64
A         gtcaACGTACGTACGTACGTACGTACGTACGT
B         ACGTgtcaACGTgtcagtcaACGTACGTACGT
C         ACGTACGTgtcaACGTACGTgtcagtcagtca

          ACGTACGTACGTACGTACGTACGTACGTACGT
          ACGTACGTACGTACGTACGTACGTACGTACGT
          ACGTACGTACGTACGTACGTACGTACGTACGT