Brain shark link inoperative but all lead back to catalog of Perkin-Elmer test kits for e.g. Tim-3, CTLA-4. That leads to the unsolved mystery of PKI's Cliff Hoyt's name on 1 or 2 of PPHM et al posters/abstracts cached by CJG above. Wooster...BASF had a large research facility there in late '80s that I remember from flying there to consult on validity of a mab patent of concern to Knoll execs and molecular biologists. Wonder if any of companies in your string fell heir to that facility when BASF left?