Researchers described a two‑photon photoresist method to 3D‑print micrometer‑scale structures inside living cells with submicron resolution; printed objects persisted through cell division and did not ablate cell viability. The technique, reported in Advanced Materials, used biocompatible photoresists and targeted lasers to polymerize structures that could act as internal probes or microdevices. Separately, µMAP — a photocatalytic proximity labeling platform — was highlighted for mapping biomolecular interactions with millisecond illumination control and nanometer spatial resolution, enabling high‑precision deconvolution of small‑molecule mechanisms and protein networks in living cells. Both methods expand the experimental toolkit for manipulating and mapping intracellular environments: one by physically constructing features inside cells, the other by temporally precise chemical labeling to trace proximity networks — capabilities that can accelerate mechanistic discovery and target deconvolution.