GJA1 and Cerebral ischemia: 3.4. Effects of 1.5% ISPOC, TGF-β1 Inhibitor LY2157299, p-Cx43 Inhibitor Ro318220, and p-Cx43 Activator 18β-GA on Neuronal Morphology in the Hippocampal CA1 Region after Cerebral Ischemia/Reperfusion in Rats (Nissl Staining)