@article {473,
	title = {Lectin-induced mucus release in the urn cell complex of the marine invertebrate Sipunculus nudus (Linnaeus)},
	journal = {Science},
	volume = {206},
	year = {1979},
	note = {@ THE MUCOCILIARY URN CELL COMPLEX OF S. NUDUS SECRETES MUCUS 4-5 MINUTES AFTER BEING EXPOSED TO LOTUS TETRAGONOLOBUS AND RICINUS COMMUNIS AGGLUTININS. SURFACE BINDING OF BOTH LECTINS IS CONFINED TO THE SECRETORY AREA OF THE URN CELL COMPLEX AND, LIKE THE RELEASE OF MUCUS, IS INHIBITED BY THE SPECIFIC SACCHARIDES L-FUCOSE AND D-GALACTOSE OR BY INCUBATION IN L-FUCOSIDASE \& D-GALACTOSIDASE. MUCUS SECRETION MAY THEREFORE BY INITIATED BY THE INTERACTION OF MUCUS-RELEASING STIMULI WITH FUCOSYL OR GALACTOSYL RESIDUES OF SPECIFIC MAMBRANE RECEPTORS. *FROM TEXT* URN CELL COMPLEX CONSIST OF ANTERIOR VESICLE CELL AND POSTERIOR BASAL CELL. MUCUS SECRETED FROM BASAL CELL IN RESPONSE TO A VARIETY OF STIMULI, E.G. FOREIGH CELLS, EPITHELIAL SECRETIONS, AND HEATED AUTOLOGOUS AND HETEROLOGOUS SERUMS. IMPORTANT ROLE IN IMMUNE RESPONSE.. TRAP THEN PHAGOCYT, LYSED BY OTHER COEL CELLS.},
	pages = {698-700},
	keywords = {mucus, s. nudus, urn cells},
	author = {Nicosia, S. V.}
}
@article {220,
	title = {A light and electron microscopic study of the ciliated urn of Phascolosoma agassizii (Sipunculida) ______________________},
	journal = {Cell and Tissue Research},
	volume = {169},
	year = {1976},
	note = {@ FREE CILIATED URN OF P.AG. STUDIED BY E.M. MULTI-(NOT BI)CELLULAR STRUCTURE COMPOSED OF 3 CELL TYPES; A. CILIATED CELLS WHICH POSSIBLY FUNCTON IN CAPTURING CELL DEBRIS AND FOREIGN PARTICLES; B. CUPOLA CELLS ABLE TO PHAGOCYTOZE LATEX PARTICLES; C. LOBE CELLS THAT PHAGOC. CARBON PARTICLES. LOBES SEPARATE FROM CILIATED BY SEMILUNAR AREA WITH MUCOPROTEIN STAINING CHARACTERISTICS, CONTAINING FIBRILS WHICH APPEAR TO BE THE STRUCTURAL SUPPORT FOR THE URN. CILIATED CELLS AND LOBES ARE ATTACHED TO THE SEMILUNAR AREA BY HEMIDESMOSOMES. *TEXT; 57 X 61UM; *CITES SOME BANG \& BANG FROM 62, 65...},
	pages = {67-75},
	keywords = {p. agassizii, ultrastructure, urn cells},
	author = {Dybas, L.}
}
@article {128,
	title = {Cell recognition by mucus secreted by urn cell of <i>Sipunculus nudus</i>},
	journal = {Nature},
	volume = {253},
	year = {1975},
	note = {@ URN CELLS OF S. NUDUS SECRETE MUCUS THAT IS STICKY FOR FOREIGN CELLS BUT NOT FOR AUTOLOGOUS CELLS. TRIED TO ALTER AUTOLOGOUS ERYTHROCYTES TO MAKE THEM {\textquoteright}FOREIGN{\textquoteright} TO URN MUCUS. URN CELLS ARE BICELLULAR ORGANELLES ABOUT 20UM IN DIAM, W VESICULAR ANTERIOR CELL AND A LOOSELY ATTACHED CILIATED MUCUS-SECRETORY CELL (FIG.1). LATTER ORIGINATES IN EPITHEL. LINING OF COELOM, DETACH \& SWIM PICKING UP FOREIGN W NORMAL STICKY TAILS. CAN PRODUCE LONG TAILS IF INVASION OF FOREIGN STUFF.},
	pages = {634-635},
	keywords = {mucus, s. nudus, urn cells},
	author = {Bang, F. B. and Bang, B. G.}
}
