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| Figure 1. Among the several HCG forms that appear in the blood are free alpha subunit, free beta subunit, nicked free beta (with cleavage sites--between amino acids 47 and 48, 43 and 44, or 44 and 45--in blue), intact dimer, nicked dimer (includes nicked beta subunit), and beta-core fragment (amino acids 6 ‚ 40 and 55 ‚ 92). |