Table 2.

Antibody staining profiles

	Cytokeratin 14 (clone LL002)	Cytokeratin 19 (clone LP2K)	Vimentin	Epithelial membrane antigen (clone 33A10)	α6-Integrin	Oestrogen receptor (clone 1D5)	CD45	Telomerase (clone α-TERT)
SP	0.5 (567)	5 (309)	63 (194)	4 (356)	44 (396)	41 (108)	5 (290)	35 (99)
Non-SP	15 (265)	39 (144)	23 (100)	16 (102)	10 (181)	56 (113)	40 (211)	5 (86)

Data presented as the percentage of bright cells (number of cells counted). Summary of staining profiles for mouse mammary epithelial side population (SP) and non-SP cells.