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Figure 1. Cell Cycle Analysis of Proliferating HeLa cells. HeLa cells were pulsed with 10 μM EdU for 1 hour, and then fixed, permeabilized, and stained with Eterneon™ Red azide azide and BD Pharmingen™ DAPI Solution (Cat. No. 564907) according to the recommended assay procedure. Histograms were derived from gated events based on light scattering characteristics of intact HeLa cells. Flow cytometric analysis was performed using a BD LSRFortessa™ Flow Cytometry System. Figure 2. Fluorescent Staining of HeLa Cells for EdU Incorporation and Histone H3 (pS28). HeLa cells were seeded in a 96-well imaging plate at ~15,000 cells per well. After overnight incubation, cells were pulsed with 10 μM EdU for 1 hour, and then fixed, permeabilized, and stained with Eterneon™ Red azide (pseudo-colored red) according to the Recommended Assay Procedure. Cells were washed twice and stained with Alexa Fluor® 488 Rat Anti-Histone H3 (pS28) (pseudo-colored green, Cat. No. 558610). Nuclei were counterstained with DAPI (pseudo-colored blue). Eterneon™ Red appears magenta when colocalized with DAPI, and Alexa Fluor® 488 Rat Anti-Histone H3 (pS28) appears cyan when colocalized with DAPI. Images were captured on a BD Pathway™ 435 Bioimager System with a 20X objective and merged using BD Attovision™ software.