Figure 1
Catalogue of some possible contents of the unit cell for a crystal of space group P4. The contents of the asymmetric unit are as follows: top row, (a) one monomer, (b) two monomers, (c) biological homodimer, (d) two biological homodimers; middle row, (a) three biological heterodimers, (b) biological heterotetramer, (c) biological homotetramer, (d) one monomer of a biological homotetramer; bottom row, (a) one heterodimer of a biological hetero-octamer, (b) two monomers of a biological homo-octamer, (c) biological homopentamer, (d) biological heteropentamer. |