Sigma L9393 polyclonal. For me, works on human, mouse, chick, with proteolytic or M/W pretreatment ( I prefer M/W; less variable). --- 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