ASGR1 and animal viral hepatitis: 99mTc-labeled galactosyl human serum albumin ([99mTc]GSA) has shown that it binds specifically to the ASGPR and allows estimation of regional hepatic function and the progression of chronic viral hepatitis in preclinical and clinical studies.42,43 Haubner et al developed a 68Ga-labeled analog44 for PET imaging studies (Figure 6A).