Nanduri B, Eoff RL, Tackett AJ, Raney KD. Measurement of steady-state kinetic parameters for DNA unwinding by the bacteriophage T4 Dda helicase: use of peptide nucleic acids to trap single-stranded DNA products of helicase reactions. Nucleic Acids Res. 2001 Jul 01; 29(13):2829-35.