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| Cell-surface marker | SP cells | Non-SP cells |
|---|---|---|
| GD2 | ++++ | ++ |
| c-kit | ++++ | ++ |
| CD45 | - | - |
| CD71 | - | +/- |
| CD56 | +/- | +/- |
| AC133 | - | - |
Positivity was assessed by fluorescence-activated cell sorting; the cut-off was measured against an isotype control antibody. Ranking percent positive cells:-, <5%; +/-, 6-10%; +, 10-20%; ++, 21-40%; +++, 41-70%; ++++, >70%.
