Crystal data for two enkephaline peptides

The two enkephaline Tyr-Gly-Gly (I) and Phe-Met (II) peptides have been crystallized with the following crystal data: (I) space group P2₁2₁2 or P222₁ (Z = 4); a = 9.549 (3), b = 8.073 (2), c = 18.424 (5) Å; (II) space group I4₁ (Z = 8); a = b = 23.891 (4), c = 5.589 (3) Å.