Cell and Tissue Research

, Volume 181, Issue 4, pp 487–492

‘Disk shedding’ in the cone outer segments of the teleost, Poecilia reticulata P.

  • Anwar Yacob
  • Yvette W. Kunz

DOI: 10.1007/BF00221770

Cite this article as:
Yacob, A. & Kunz, Y.W. Cell Tissue Res. (1977) 181: 487. doi:10.1007/BF00221770


Electron microscopical observations show that the cones in the retina of the diurnal Poecilia reticulata shed their membranous outer segment disks. This occurs at the side of the disk which is open to the extracellular space. Shedding is observed in single and twin cones and occurs at any level of the outer segment. The disks are not discarded in packages or as single disks, but are shed in small vesicular portions. This mode of ‘disk shedding’ may explain why in cone outer segments radioactively labelled replacement protein is diffusely distributed.

Key words

Disk shedding Cone outer segments Teleost retina Poecilia reticulata Ultrastructure 

Copyright information

© Springer-Verlag 1977

Authors and Affiliations

  • Anwar Yacob
    • 1
  • Yvette W. Kunz
    • 1
  1. 1.Department of ZoologyUniversity CollegeDublinIreland
  2. 2.Department of ZoologyUniversity CollegeBelfield, DublinIreland

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