In article <2ohukk$vm at mserv1.dl.ac.uk>, Jose_Costoya <Jose-Costoya at SEINS.usc.es> writes: Jose, Pharmacia has a kit called Ready-To-Go DNA labelling kit. This will allow the incorporation of biotin labelled dCTP into your oligo and is in a convienient one use format-call me at Pharmacia if you have any questions-Joe Dagostino-Pharmacia Biotech-800 526-3593