“…In this phase, the cell activities outside the living organism were carefully examined. Almost all the literature found in the Scopus database since 2017 ( Table 7 ) performed in vitro evaluations using simulate body fluid (SBF) and/or various cell types on hydroxyapatite from porcine bone [ 90 ], bovine bone [ 91 , 92 ], fish bone [ 94 , 95 , 97 , 100 ], fish scale [ 96 ], eggshell [ 101 , 102 , 103 , 104 , 105 , 106 , 108 ], oyster shell [ 109 ], seashell [ 111 ], cockle shell [ 112 ], and snail shell [ 113 ]. Analysis revealed that the synthesized hydroxyapatite enhanced the apatite formation, making it similar to human bone.…”