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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Two-photon excitation PDT effect of SiNPs on 3D cultures. Spheroids from MCF-7 cells were treated or not with 50 µg mL−1 of SiNPs for 24 h and irradiated or not with pulsed laser at 900 nm (3 scans × 1.57 s). Pictures are representative of the whole. Scale bar: 100 µm.