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Volume 2016, Article ID 1535490, 5 pages
Research Article

Short Wavelength Cone Opsin Is Not Expressed in the Retina of Arboreal African Pangolin (Manis tricuspis)

1Department of Anatomy, Faculty of Basic Medical Science, College of Medicine, University of Ibadan, PMB 5017 GPO, Ibadan, Nigeria
2Department of Anatomy, College of Health Sciences, University of Ilorin, PMB 1515, Ilorin, Nigeria
3Department of Neurological Surgery, University College Hospital Ibadan, PMB 5017, Ibadan, Nigeria

Received 28 December 2015; Revised 25 March 2016; Accepted 18 April 2016

Academic Editor: Ji C. He

Copyright © 2016 Adejoke J. Adekanmbi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper reports a study of cone photoreceptors present in the retina of Manis tricuspis. Specifically, the LWS (L-) opsin expressed in longwave-sensitive cones and SWS1 (S-) opsin shortwave-sensitive cones were targeted. Vertical sections revealed reactivity to a cone marker, peanut agglutinin (PNA), and to an LWS antibody, but not to an SWS1 antibody. This suggests that the Manis tricuspis visual system is not able to discriminate shorter wavelengths from longer wavelengths because the short wavelength cones are not expressed in their retina.