Figure 2
![Figure 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1754-6834-7-58/MediaObjects/13068_2013_Article_460_Fig2_HTML.jpg)
Comparison of variation of SCRS. (A) Variation of Raman spectra of one Group N- cell at 48Â hours for 20 continuous measurements. (B) Variation of Raman spectra of 20 Group N- cells at 48Â hours as an example. SD is shown in gray. SCRS: single-cell Raman spectra; SD: standard derivation.