If aspartate and two glutamates are on one beta loop and another glutamate is on another beta loop, and has been witnessed to have a strong spherical shaped density by these side chains, and fit the electron density to a Ca2+ ion, what might this binding site appear as? Below is an image for reference.

(- B8B9 Cys-Loop B1B2 Cat E44 Loop Loop K45 2.7 D265 Ca E44 R205 EVE V131 E172 R206 R205 M260 B 33 R132 M2-M3 Loop M2 L208 La M2 M1 F478 M3