Skin grafts and cheetahs

Article Abstract:

S.J. O'Brien and colleagues's finding that Cheetah's lack genetic variation is substantiated by a study that demonstrated the acceptance of allografts by pocket gophers with low genetic variation. Low variation Patricks J and Patricks F gopher populations accept within population allografts while the high variation Hastings gopher population reject the allografts. The Patricks gophers that accept within population allografts reject those from Hastings gophers. Results of the study support O'Brien's finding of low genetic variation and monomorphism at the major histocompatibility complex in cheetahs.

Genetic aspects, Cheetahs, Homografts, Pocket gophers

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Dissociation between mental imagery and object recognition in a brain-damaged patient

Article Abstract:

A brain-damaged patient had normal visual imagery despite suffering from visual object agnosia or the impairment of object recognition. The patient, identified as C.K., can sketch pictures of objects from memory and can draw on mental images but cannot recall the names of visually presented objects even after he has drawn them. C.K.'s visual acuity and perception of objects in other domains are normal. This case indicates that mental representations can provide visual imagery even when those representations cannot be translated into visually mediated perceptions.

Case studies, Brain damage, Perception, Disorders of, Perceptual distortion, Agnosia

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Cultivating a cure for blindness: damaged corneas can often be repaired using donor grafts, but if the damage is too great the graft will be rejected

Article Abstract:

Human corneas have an immune privilege which enables them to be repaired using donor grafts, without immune rejection, but if the damage is too severe there may be problems of rejection. However research has found that human limbal stem cells can extend the immune privilege, and the method has been used to advantage in corneal epithelial grafts. Limbal epithelial primary grafting could be further developed to restore full vision to many totally blind people.

Prevention, Graft rejection, Cornea, Corneal transplantation

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