You can "vent" this soft, ductless organ that fights infection with parasite detection
When a tiny parasite enters an oyster's shell, 
mantle cells cover it with nacre until this is formed ... You can "vent" this soft, 
ductless organ that fights infection with parasite detection... [DOC] [TLE] spleen - Search-ID.com [PAR] The spleen is an organ foun in all vertebrate animals.