Fig. 8: Internalization of Tf into MM.1S cells in the presence of ch128.1/IgG1.

a, b Standard and (c–e) imaging flow cytometric analysis of Tf internalization in the presence of the IgG1/κ isotype control (red line) or ch128.1/IgG1 (green line). Negative control unstained cells (gray-filled) are also shown. a MM.1S cells incubated on ice for 60 min, after 30 min at 37 °C and after 60 min at 37 °C. b Median fluorescence intensities of Tf fluorescence over time. c Representative images of cells incubated for 60 min at 37 °C. d Internal fluorescence intensities of imaging flow cytometry at 37 °C for 60 min. e Geometric mean fluorescence intensities of internalized Tf over time.