About: http://webisa.webdatacommons.org/135547466

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	They consist of organic matter, a colloid, which is secreted by pinealocytes and layered with calcium and magnesium salts, mainly phosphates.
http://www.w3.org/ns/prov#wasQuotedFrom	learning-mind.com