GABBR2 and internet addiction disorder: Increased expression of two mRNAs encoding gamma-aminobutyric acid (GABA-A) receptors (GABRA1 and GABRA2) and one GABA-B receptor (GABBR2) in IAD patients, may indicate GABAergic terminal sprouting and suggests that inhibitory compensatory mechanisms may also be activated, perhaps due to aberrant increases in network excitability as in the hAPP transgenic mouse [65].