Decades: 1220s 1230s 1240s 1250s 1260s - 1270s - 1280s 1290s 1300s 1310s 1320s
Years: 1267 1268 1269 1270 1271 - 1272 - 1273 1274 1275 1276 1277
Births
Deaths
... acids (either naturally present on the surface of the protein or grafted with recombinant DNA techniques) and various immobilized metal ions, such as copper, nickel, ...