Hi A collegue is asking about Clustan : There is a VAx version (the original one) : is there a Unix version Available, or better a Mac one? Thank you for your help. -- Dr Nathalie Castells-Brooke I hear and I forget Bioinformatic Department I see and I remember IACR Rothamsted I do and I understand http://www.res.bbsrc.ac.uk/molbio/guide Confucius