. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. UT ZC BT. Figure 4. (A) Light micrograph of a cross-section of a colony of sp. (10% formalin-seawater fixation; I0-/u,m-thick paraffin section stained with hematoxylin and eosin). Scale, 200 ,uin. (B) Higher magnification light micrograph of a tunic bladder cell ( glutaraldehyde prefixation and 1% OsO4 postfix- ation; l-/Min-thick resin section stained with toluidine blue). Scale. 10 (C and D) Schematic representations of A and B. respectively. CC, cloacal cavity; N, nucleus of tunic bladder cell; TB. tun
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. UT ZC BT. Figure 4. (A) Light micrograph of a cross-section of a colony of sp. (10% formalin-seawater fixation; I0-/u,m-thick paraffin section stained with hematoxylin and eosin). Scale, 200 ,uin. (B) Higher magnification light micrograph of a tunic bladder cell ( glutaraldehyde prefixation and 1% OsO4 postfix- ation; l-/Min-thick resin section stained with toluidine blue). Scale. 10 (C and D) Schematic representations of A and B. respectively. CC, cloacal cavity; N, nucleus of tunic bladder cell; TB. tunic bladder cell; TC, other tunic cells; V, vacuole of tunic bladder cell; Z. zooid; small structures (dots) in CC, cells of Prochloron sp. mechanisms underlying translocation of MAAs and their uptake by the tunic bladder cells remain to be elucidated. Acknowledgments We are grateful to Prof. R. A. Lewin for discussion. Staff members at Akajima Marine Science Laboratory are ac- knowledged for their help during sample collection. This work was performed as a part of The Industrial Science and Technology Project, Technological Development of Biolog- ical Resources in Bioconsortia, supported by the New En- ergy and Industrial Technology Development Organization (NEDO). The present study is partly supported by a JSPS Grant-in-Aid. Literature Cited 1. Barker, K. S., R. C. Smith, and A. E. S. Green. 1980. Middle ultraviolet radiation reaching the ocean surface. Photochem. Photobiol. 32: Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laborato
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