About: http://webisa.webdatacommons.org/180446798

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	The key organs of the immune system are thymus , spleen , bone marrow , lymph vessels , lymph nodes and secondary lymphatic tissues such as tonsils and adenoids ) and skin .
http://www.w3.org/ns/prov#wasQuotedFrom	bio-medicine.org