ng_center</strong>:  Sequencer Center responsible for identifying this mutation.  For example:  broad.mit.edu.</li>
                <li><strong>mutation_status</strong>:  somatic or germline mutation status.  all mutations returned will be of type somatic.</li>
                <li><strong>mutation_type</strong>:  mutation type, such as nonsense, missense, or frameshift_ins.</li>
                <li><strong>validation_status</strong>:  validation status.  Usually valid, invalid, or unknown.</li>
            