1M5Q_1|Chains AA[auth 2], A[auth 1], BA[auth B], B[auth A], C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z|small nuclear ribonucleoprotein homolog|Pyrobaculum aerophilum (13773) label=1