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. Author manuscript; available in PMC: 2016 Apr 13.
Published in final edited form as: J Biomech. 2015 Feb 7;48(6):1058–1066. doi: 10.1016/j.jbiomech.2015.01.033

Fig. 2. Validation of beacon detection approach.

Fig. 2

(A) Raw fluorescence and postprocessed signals were evaluated in a control population of ASCs. Validation experiments included treatment with a quencherless random beacon, fluorophore/quencher random beacon, and PPARG beacon. Positive signals (green) overlapping with cell nuclei (blue) were used to calculate the percent of positive cells in a population. (B) Results indicated baseline, non-specific signal was approximately 30 – 40%, whereas maximal signal was approximately 80 – 90%, representing our limits of detection. (C) ASCs were treated with a beacon for the housekeeping gene GAPDH, which should be present in all cells. A small fraction of cells did not exhibit positive signal (false-negatives). (D) The mechanical properties of single, GAPDH+ and GAPDH− cells were characterized with AFM; Eelastic is illustrated here with violin plots. No significant differences were detected between positive and negative signal groups (p = 0.48), indicating the presence of beacon did not affect measured, cellular mechanical properties.