Dual color laser microscopic images showing the internalization of the CD33 antibody P67.6.

The CD33⁺ myeloid cell line MEG-01 was incubated at 37°C with P67.6-FITC for different periods as indicated, followed by labeling with CD13 and GαM-TRITC. The upper panel shows the P67.6-FITC staining (green channel), and the bottom panel shows the red channel of exactly the same image displaying the membrane staining with CD13/GαM-TRITC (bar = 10 μm).