Structure and function of the SIT1 proline transporter in complex with the COVID-19 receptor ACE2 by Li, HZ, Pike, ACW, Lotsaris, I, Chi, G, Hansen, JS, Lee, SC, Rödström, KEJ, Bushell, SR, Speedman, D, Evans, A, Wang, D, He, D, Shrestha, L, Nasrallah, C, Burgess-Brown, NA, Vandenberg, RJ, Dafforn, TR, Carpenter, EP, Sauer, DB