In article <463skp$m0l at saba.info.ucla.edu>, John Ferbas <Ferbas at cyto.medsch.ucla.edu> writes: >Sigma no longer sells NP-40, and I am unaware of any other vendors. >Does anyone know another vendor? A quick check of my catalogs shows NP-40 is also sold by Boehringer Mannheim and USB. Hope this helps.