perfusion of whole worms and isolated tissues with 10 ( 4 ) m-serotonin further indicated : ( 1 ) immunolabeled patches and dense vesicles were often associated with cytoskeletal elements , ( 2 ) serotonin did not appear to enter the intestinal or muscle cells by endocytosis , ( 3 ) immunolabeled patches examined with energy dispersive x-ray spectrometry ( x-ray microanalysis ) were found to contain iron at concentrations approximately double that of the surrounding cytoplasm .
C0010853
cytoskeletal
C0010834
cytoplasm