Andy - part of my last message was not kept, for some reason. I began with
a paragraph in which I said I appreciated your definitions, which
were quoted below. I accept that biologists working on cell division
call cell lines that do not stop replicating to be 'immortal'. I am
also a biologist, and would rather define 'immortal' (if I would use the
word at all) for an individual cell or an individual polycellular orga-
nism. The word immortal, however, is not very exact as it is not easy to
prove.
Thank you for explaining the terminology of biologists working on cell
lines. It clearly helps the discussion.
Wouter van Doorn
ATO-DLO, Wageningen, The Netherlands.
