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Specificity of the bioprobes: (A) GCA, (B) deoxycholic acid, (C) ursodesoxycholic acid, (D) glycyl ursodeoxycholic acid, (E) glycochenodeoxycholic acid, (F) taurocholic acid, (G) hyodeoxycholic acid, and (H) cholic acid. These results were recorded on a bright background with a camera.
