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Immunohistochemistry was performed to probe the presence and the mechanism of interaction with other cells for the EC in bioprinted gels after 5 days of culture. CM and CF were prestained with PKH26 (red) and PKH67 (green), respectively. The ECs were immunostained using primary followed by secondary antibodies targeted toward CD31 (blue). The magnified figure insets are presented in Supporting Figures S5–S7.
