/********************************************************************************** * A grammar for the tRNA, paired bases(X_y and y_X) are favored by the * * low weights(0.125<1) for unpaired ones. * **********************************************************************************/ TYPE = GRAMMAR SYMBOLS = WORDS START = tRNA RULES = tRNA -> A_Stem A_Site ; A_Stem -> A_u A_Stem a_U ; A_Stem -> U_a A_Stem u_A ; A_Stem -> C_g A_Stem c_G ; A_Stem -> G_c A_Stem g_C ; A_Stem -> MultiLoop ; A_Site -> A A_Site ; A_Site -> U A_Site ; A_Site -> C A_Site ; A_Site -> G A_Site ; A_Site -> ; MultiLoop -> Fill D_Stem C_Stem Variable_Loop T_Psi_C_Stem ; Fill -> A Fill ; Fill -> U Fill ; Fill -> C Fill ; Fill -> G Fill ; Fill -> ; D_Stem -> A_u D_Stem a_U ; D_Stem -> U_a D_Stem u_A ; D_Stem -> C_g D_Stem c_G ; D_Stem -> G_c D_Stem g_C ; D_Stem -> D_Loop ; D_Loop -> Fill ; C_Stem -> A_u C_Stem a_U ; C_Stem -> U_a C_Stem u_A ; C_Stem -> C_g C_Stem c_G ; C_Stem -> G_c C_Stem g_C ; C_Stem -> C_Loop ; C_Loop -> Fill ; Variable_Loop -> Fill; T_Psi_C_Stem -> A_u T_Psi_C_Stem a_U ; T_Psi_C_Stem -> U_a T_Psi_C_Stem u_A ; T_Psi_C_Stem -> C_g T_Psi_C_Stem c_G ; T_Psi_C_Stem -> G_c T_Psi_C_Stem g_C ; T_Psi_C_Stem -> T_Psi_C_Loop ; T_Psi_C_Loop -> Fill ; WEIGHTS = A 0.125 U 0.125 C 0.125 G 0.125 ALIASES = A_u = A' a_U = U' C_g = C' c_G = G' U_a = U' u_A = A' G_c = G' g_C = C'