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LAT condensation is challenging to study in vivo and is therefore often investigated using reconstitution experiments. While these experiments recapitulate key aspects of LAT condensation, they also exhibit some puzzling features. Here, we describe the mechanisms underlying these observations using two complementary models. First, we employ a Smoluchowski aggregation model to show that the delay time before condensation is observed arises from a low effective binding probability between LAT monomers. Second, we propose a field-theoretic model that reproduces all condensate morphologies observed in experiments, showing that they can arise from common underlying dynamics, modulated by variations in experimental conditions. This result unifies different experimental observations reported previously. While this article addresses open questions regarding the formation of LAT condensates, our results also provide a common framework for understanding the condensation of other multivalent membrane proteins such as EGFR, FGFR2, and nephrin.<\/jats:p>","DOI":"10.7554\/elife.109567","type":"journal-article","created":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T10:15:09Z","timestamp":1786356909000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.109567","source":"Crossref","is-referenced-by-count":0,"title":["A unifying model of T-cell signaling protein condensates in reconstitution experiments"],"prefix":"10.7554","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-6700-2519","authenticated-orcid":true,"given":"Yannick Azhri Din","family":"Omar","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/042nb2s44","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of Chemical Engineering, Massachusetts Institute of 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