In article <39tbho$6td at mserv1.dl.ac.uk>, LMS <lee.smith at afrc.ac.uk> (Tel 0635 578411 X2598) writes: PE buffer is a wash that uses etoh and pb uses guadhcl as a wash, if that helps, exactly, I don't know, it is at the lab and i will have to check on it, okay, get back to you andy kravetz st. louis university institute for molecular virology st. louis, mo