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. 2021 Jul 21;10(8):1843. doi: 10.3390/cells10081843

Figure 3.

Figure 3

Detection of SARS-CoV-2 Spike-specific FluoroSpots is influenced by protein-coating efficiency. Murine B-cell hybridomas (~100 cells/well) were evaluated for total or antigen-specific FluoroSpot formation (detailed in Materials and Methods). (A) Representative well images of murine B-cell hybridomas secreting monoclonal antibody (mAb) (IgG1, κ) with specificity for the full-length (FL) SARS-CoV-2 Spike protein. Contrast enhancements were uniformly performed on all images to aid their visualization in publication. (B) Total or Spike-specific SFU/well (mean ±SD) for each B-cell hybridoma line. Significant differences in SFU/well were determined using an analysis of variation (ANOVA) with Sidak’s post hoc test. *** p < 0.001. (C) Spike-specific FluoroSpots were merged into FCS files and visualized as bivariate plots. FluoroSpots originating from assay wells in which Spike protein was directly captured on the membrane (black dots) or through affinity capture (red) are shown as overlays. The combined number of FluoroSpots detected in replicate wells for each of the respective donors is indicated in the inset using the same red/black color code.