Electron density corresponding to GHRP in hole “a” of the 2 molecules in the asymmetric unit of rfD-BβD432A+GH. The |Fo − Fc| electron density around GHRP (shown as green sticks) is contoured at 3.0σ. The 2 calcium binding sites γ1 and γ2 are shown as orange spheres. Note that the calcium in γ2 site is absent in the other molecule of the asymmetric unit.