Conformationally Induced Off–On Cell Membrane Chemosensor Targeting Receptor Protein-Tyrosine Kinases for <i>in Vivo and in Vitro</i> Fluorescence Imaging of Cancers
SP1 at the target terminal. The unique signal response mechanism enables SP1 use for fluorescence microscopy imaging of receptor protein-tyrosine kinases in the cellmembranes of living cells, allowing for the rapid differentiation of cancer cells from normal cells. SP1 can be used to visualize the chick embryo chorioallantoic membrane and mouse model tumors, suggesting its possible application for