I am looking for E. coli strains CC118 l-pir and E. coli S17-1 l-pir used for TnPhoa mutagenesis. I will appreciate obtaining these if someone out there can help. Thank you in advance. Name: Ashu Sharma Tel: (716) 829-3518 Fax: (716) 829-3942 E-mail: sharmaa at acsu.buffalo.edu