length > 0 ) {

					const object = root.children[ 0 ];
					object.parent.remove( object );

				}

				loader.load( url, function ( pdb ) {

					const geometryAtoms = pdb.geometryAtoms;
					const geometryBonds = pdb.geometryBonds;
					const json = pdb.json;

					const boxGeometry = new THREE.BoxGeometry( 1, 1, 1 );
					const sphereGeometry = new THREE.IcosahedronGeometry( 1, 3 );

					geometryAtoms.computeBoundingBox();
					geometryAtoms.boundingBox.getCenter( offset ).negate();

					geometryAtoms