Absence of short-wavelength sensitive cones in the retinae of seals (Carnivora) and African giant rats (Rodentia).
Eur J Neurosci
; 10(8): 2586-94, 1998 Aug.
Article
en En
| MEDLINE
| ID: mdl-9767389
ABSTRACT
Most non-primate mammals have two types of cone short-wavelength sensitive (S) and middle-to-long-wavelength sensitive (M/L) cones. In two species of African giant rats, Cricetomys gambianus and C. emini, and in two species of earless seals, Phoca hispida and P. vitulina, the retinal cone types and cone distributions were assessed with antibodies specific for the M/L-cone opsin and the S-cone opsin, respectively. All four species were found to completely lack S-cones, while M/L-cones were present in low densities. M/L-cone densities, rod densities and cone/rod ratios were determined across the retina. Cone proportions are about 0.3-0. 5% in C. gambianus, 0.5-0.8% in C. emini, and 1.5-1.8% in P. hispida. An absence of S-cones has previously been reported in a few nocturnal mammals. As earless seals are visually active during night and day, we conclude that an absence of S-cones is not exclusively associated with nocturnality. The functional and comparative aspects are discussed.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Células Fotorreceptoras Retinianas Conos
/
Phocidae
/
Muridae
Tipo de estudio:
Diagnostic_studies
Límite:
Animals
Idioma:
En
Revista:
Eur J Neurosci
Asunto de la revista:
NEUROLOGIA
Año:
1998
Tipo del documento:
Article
País de afiliación:
Alemania