Protein kodiran ovim genom pripada porodici trombospondina. Članovi porodice trombospondina su adhezivni glikoproteini koji posreduju u interakcijama ćelija-ćelija i ćelija-matriks. Utvrđeno je da je TSP3 uključen u regulaciju sazrijevanja skeleta.[8] Ovaj protein formira pentamernu molekulu povezanu jednom disulfidnom vezom. Ovaj gen dijeli zajednički promotor s metaksinom 1.[6] Identificiran je kao gen na hromosomu 1, odgovoran za posredovanje vze s genetskičm osjetljivošću na infekcijeSARS-CoV-2.[9]
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