Table 1. Summary of average SCC SP cell abundance.

Cell line	Average % of SP	s.d.	Minimum/maximum % of SP	No. of replicates
H357	0.470	0.160	0.25/0.63	4
SCC4	0.385	0.177	NA	2
SCC13	0.270	0.028	NA	2
SCC15	0.076	0.063	NA	2

NA=not applicable; SCC=squamous cell carcinoma; SP=side population.

SP analysis performed at 70% cell confluence.