Fig. 4
Long-term in vivo immune tracking. a Near-infrared imaging of Ag2S@OVA and Ag2S@OVA-R837 pre- and post-laser irradiation. b NIR imaging over a period of 0–72 h in BALB/c mice post-tail vein injection with Ag2S@OVA-R837 nanoparticles. c–d Near-infrared imaging from day 1 to day 7 in tumor-bearing BALB/c mice, without (c) and with (d) photothermal immunotherapy. A and B indicate axillary lymph nodes, while C denotes the spleen