Apparently my practice of starting new threads by replying with a changed subject was not sufficient to actually start a new thread for some mail readers. I wasn't aware of this issue until one of you just told me, as my mail reader doesn't thread like that.

My apologies to all of you whose threads I have accidentally highjacked this way!

David Mathog mathog@...1176... Manager, Sequence Analysis Facility, Biology Division, Caltech