Outfix-free and intercode constraints for DNA sequences

DNA sequences can be regarded as sequences consisting of 4 symbols A (adenine), C (cytosine), G (guanine), and T (thymine). Many constraints for the DNA sequences are studied because when the DNA sequences are used as fundamental ingredients for computation or processing information, the DNA sequences should satisfy constraints so that molecular biological processes are done with small error probabilities. We explain constraints of the DNA sequences for hybridization. We also show some results on outfix-free and intercode constraints for DNA sequences.