Study to Determine the Safety and Tolerability of TG-C in Subjects With Back Pain Due to Degenerative Disc Disease

Inclusion Criteria: * Between the ages of \>= 22 and \<= 70 * Provides written informed consent before undergoing any study specific procedures * Chronic lower back pain for at least 6 months. Back pain twice as great as leg pain measured using NRS * VAS between \>= 40 and \<= 90 * ODI Index \>30 and \<= 80 * Inadequate response to at least one medication (e.g., NSAID, acetaminophen, muscle relaxant) and some form of formal physical therapy over a period of at least 6 months, within 6-9 months of screening. * Diagnosis of DDD from L1 to S1, confirmed by patient history and radiographic studies * Modified Pfirrmann score of 3-7 on MRI * With or without contained disc herniations of \<3 mm protrusion * If more than 1 degenerative disc is identified. PD must be performed 30 days prior and ensure only one level is the pain generator * BMI \>15 and \< 30 kg/m2 * Use birth control Exclusion Criteria: * Co-morbid medical condition of the spine or upper extremities * Grade 2 or higher spondylolisthesis and type III Modic changes around target disc * Suspicion of full thickness annular tear at disc * History of endocrine or metabolic disorder * Rheumatoid or psoriatic arthritis * Compressive pathology due to stenosis or herniated or sequestered discs * Symptomatic involvement of more than one lumber disc * Intact disc bulge/protrusion at \>3 mm * Lumbar intervertebral foraminal stenosis * Previous surgery at the target disc level * Epidural or facet joint steroid, platelet rich plasma (PRP) or bone marrow concentrate (BMC) injections, or radio frequency ablation (RFA), within 6 months prior to baseline. * Pregnant * Presence of ferromagnetic implants * Involved in current or pending spinal litigations * Care is provided under a Worker's Compensation claim * Physical or mental conditions * 3 or more of the 5 Waddell signs * Positive screen for HIV * Immediate family member of other participating patients * Participated within 3 months or is concurrently enrolled in non-interventional research * Transient or has a history of any substance use disorder * Currently incarcerated * Investigator site personnel or immediate family or sponsor employee * On chronic anti-coagulation therapy or have confirmed coagulopathy * Tested positive on RCR testing at screening