I don't recall collagen positivity but certainly, adipocytes are positive ( still don't know why, but it's a beautiful Ab reagent for them...I used the Dako polyclonal on human tissue) --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.668 / Virus Database: 430 - Release Date: 24/04/2004