AUTHOR: P. Therese Lang
USAGE: sphere_selector < sphere_cluster_file.sph > <set_of_atoms.mol2> <radius>
Sphere_selector will take the ouput from spghen and select all spheres with a user-defined radius of a target molecule (see sphgen). The target molecule can be anything (ie known ligand, receptor residue, etc) as long as it is in proper MOL2 format. WARNING: Please note that above order of input files must be maintained for the program to work.