[The microstructure and identification of pearl and pearl layer].
D000818:Animals; D004149:Dioxoles / Q000032:analysis*; D004340:Drug Contamination; D008516:Medicine, Chinese Traditional; D008518:Medicine, East Asian Traditional; D008974:Mollusca / Q000033:anatomy & histology / Q000166:cytology*; D011208:Powders
D004149:Dioxoles; D011208:Powders; C041398:7,7'-dimethoxy-(4,4'-bi-1,3-benzodioxole)-5,5'-dicarboxylic acid dimethyl ester