Given an abstract of a paper, generate a title for this paper such that conveys the key focus of the paper.

Abstract: Clinical and histopathological studies of two patients with distinctly different inherited juvenile retinal dystrophies indicate that the ocular defect in mitochondrial cytopathy involves the underlying pigment epithelium, whereas in the Laurence-Moon-Biedl syndrome the photoreceptor cells are primarily affected.
Histopathology of mitochondrial cytopathy and the Laurence-Moon-Biedl syndrome.