title: Formation and structure of the periostracum in Lymnaea stagnalis.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism; D003238:Connective Tissue / Q000502:physiology; D003239:Connective Tissue Cells; D004721:Endoplasmic Reticulum / Q000502:physiology; D004847:Epithelial Cells; D004848:Epithelium / Q000502:physiology; D008195:Lymnaea / Q000033:anatomy & histology* / Q000502:physiology; D008854:Microscopy, Electron; D012867:Skin / Q000033:anatomy & histology* / Q000166:cytology; D013045:Species Specificity
chemical_list: D002118:Calcium