I would like to receive sequence of lambda charon 4a vector left arm DNA from the position 18560(Kpn1-site) to the position 20660 (Sac1-site of lac5 insert). Thanks very much Dmitry Bessarab Institute of Molecular Biology Academia Sinica Nankang, Taipei,11529 Rep. of China e-mail mbdmitry at ccvax.sinica.edu.tw