MMP2 and post-traumatic stress disorder: Table 1 delineates the levels of MMP-2 and MMP-9, gamma-aminobutyric acid (GABA), and NLRP3 inflammasome across individuals with recent (≤5 years) Past PTSD, remote (>5 years) Past PTSD, and controls without PTSD history, stratified by age (18–35 years and 36–50 years).