PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 25852562-3 2015 While its hierarchical structure is unrivaled in its mechanical resilience, heterogeneity in the distribution of magnesium ions and the presence of Mg-substituted amorphous calcium phosphate (Mg-ACP) as an intergranular phase have recently been shown to increase the susceptibility of mouse enamel to acid attack. calcium phosphate 173-190 vitamin A enhanced cleft palate Mus musculus 195-198