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. 2012 Jul 2;122(8):2837–2846. doi: 10.1172/JCI59373

Figure 1. Chemical structural formulas of cyclocreatine and creatine.

Figure 1

Cyclocreatine is a kinetically similar analog of creatine that is phosphorylated and dephosphorylated by mitochondrial and cytosolic CKs. As a small, relatively planar molecule, cyclocreatine has the chemical characteristics to cross membranes.