Label-free estimation of regulatory T cell activation markers using Raman spectroscopy with machine learning. - Azari-Pour, Aria; Chamkalani, Ali; Rangan, Shreyas; MacDonald, Katherine N.; Huynh, Miles; Levings, Megan K.; Schulze, H. Georg; Piret, James M.; Gopaluni, Bhushan (Scientific Reports, 2025)