Fig. 2. (A) Cell proliferation of PSMA+ PC3 PIP cells in the presence or absence of SERS tag and SERS agent (50 pM). (B) Change of cell number of PSMA+ PC3 PIP, PSMA– PC3 flu and breast cancer MDA-MB-231 cells in the absence or presence of SERS tag and SERS agent after incubation for 7 days.