define solbindzn 63 or 66 or 133 or 184
define solbindfe 204 or 295 or 310 or 314 or 208
define solbind solbindzn or solbindfe

# another conjecture for the metal-binding sites:
define bindzn 66 or 94 or 96 or 184 or 186 or 188 or 173 or 181
define bindfe 310 or 314 or 295 or 216 or 217 or 219 or 209