Table 1. Antibodies used.

Antigen	Antibody specificity	Source
Vim	Monoclonal (clone V9), against human, rat, pig or avian; non cross-reactive with mouse; for immunostaining rhodamine conjugated	Santa Cruz Biotechnology Inc. (Santa Cruz CA)
CK K14	Monoclonal (clone L001), reactive with mouse, rat, human, porcine and canine	Santa Cruz Biotechnology Inc. (Santa Cruz CA)
	Monoclonal (clone L002), reactive with human; fluorescein conjugated	EMD Millipore (Billerica, MA)
CK K5/6	Monoclonal, clone D5/16 B4	Chemicon International, Inc. (Temecula, CA)