{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T20:43:50Z","timestamp":1792788230640,"version":"4.5.0"},"reference-count":38,"publisher":"American Chemical Society (ACS)","license":[{"start":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T00:00:00Z","timestamp":1792972800000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-029"},{"start":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T00:00:00Z","timestamp":1792972800000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-037"},{"start":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T00:00:00Z","timestamp":1792972800000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-045"}],"funder":[{"DOI":"10.13039\/100006920","name":"University of Pennsylvania","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100006920","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100002491","name":"Bristol-Myers Squibb","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100002491","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100023886","name":"Center for Undergraduate Research and Fellowships, University of Pennsylvania","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100023886","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Cellular immunotherapies have transformed oncologic treatment in recent years, yet the inability to monitor cell migration post-transfusion remains a significant barrier to their development. Here, we explore the feasibility of a non-invasive cell-tracking method utilizing Cu(I)-catalyzed click chemistry in which cells are first labeled with alkynes and, after 1\u20132 weeks, are selectively targeted via an azide-conjugated fluorescent probe. We developed Click1, a novel tris-Cu-chelating azide capable of a rapid, robust click reaction directly on live cell surfaces with minimal cytotoxicity. When paired with Click1, two distinct alkyne-labeling reagents, N-(4-pentynoyl)-mannosamine-tetraacylated (Ac4ManNAl) and propargyl choline, were capable of detecting human T cells for over two weeks. Our findings elucidate the metabolic turnover of biochemical handles in primary immune cells, providing a potential framework for long-term cell tracking in immunotherapies.<\/jats:p>","DOI":"10.1021\/acschembio.6c00610","type":"journal-article","created":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T20:01:58Z","timestamp":1792785718000},"source":"Crossref","is-referenced-by-count":0,"title":["A Biocompatible Cu(I)-Catalyzed Click Chemistry Framework for Long-Term Cell Tracking"],"prefix":"10.1021","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-5900-1892","authenticated-orcid":true,"given":"Alex H.","family":"Chen","sequence":"first","affiliation":[{"name":"Perelman School of Medicine, University of Pennsylvania , , 3400 Spruce Street , , ,","place":["Philadelphia, Pennsylvania, USA, 19104"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yingzhao","family":"Zhao","sequence":"additional","affiliation":[{"name":"Perelman School of Medicine, University of Pennsylvania , , 3400 Spruce Street , , ,","place":["Philadelphia, Pennsylvania, USA, 19104"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Soojin","family":"Kwon","sequence":"additional","affiliation":[{"name":"Perelman School of Medicine, University of Pennsylvania , , 3400 Spruce Street , , ,","place":["Philadelphia, Pennsylvania, USA, 19104"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rashmi","family":"Vyas","sequence":"additional","affiliation":[{"name":"Perelman School of Medicine, University of Pennsylvania , , 3400 Spruce Street , , ,","place":["Philadelphia, Pennsylvania, USA, 19104"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Raymond F.","family":"Gamache","sequence":"additional","affiliation":[{"name":"Perelman School of Medicine, University of Pennsylvania , , 3400 Spruce Street , , ,","place":["Philadelphia, Pennsylvania, USA, 19104"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tiantian","family":"Sun","sequence":"additional","affiliation":[{"name":"Perelman School of Medicine, University of Pennsylvania , , 3400 Spruce Street , , ,","place":["Philadelphia, Pennsylvania, USA, 19104"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hasan","family":"Babazada","sequence":"additional","affiliation":[{"name":"Perelman School of Medicine, University of Pennsylvania , , 3400 Spruce Street , , ,","place":["Philadelphia, Pennsylvania, USA, 19104"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katheryn","family":"Lohith","sequence":"additional","affiliation":[{"name":"Perelman School of Medicine, University of Pennsylvania , , 3400 Spruce Street , , ,","place":["Philadelphia, Pennsylvania, USA, 19104"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael D.","family":"Farwell","sequence":"additional","affiliation":[{"name":"Perelman School of Medicine, University of Pennsylvania , , 3400 Spruce Street , , ,","place":["Philadelphia, Pennsylvania, USA, 19104"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,10,26]]},"reference":[{"issue":"5","key":"2026102316015041800_cit1","doi-asserted-by":"publisher","first-page":"449","DOI":"10.1056\/NEJMoa1709919","article-title":"Long-term follow-up of CD19 CAR therapy in acute lymphoblastic leukemia","volume":"378","author":"Park","year":"2018","journal-title":"N. 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