In 1955, Christian de Duve and his coworkers from the School of Medicine in Louvain, Belgium, named a group of cytoplasmic formations surrounded by lipoprotein membrane and containing acid hydrolase enzymes as lysosomes. Biochemical and cytochemical studies showed lysosomes to be found in animal and
Hypokinetic-rigid syndrome (HRS) or "parkinsonism" is rare in children. From a clinical point of view it is characterised by a group of signs in which hypokinesia (decreased number of movements), bradykinesia (slowness of movements), rigidity and rest tremor are the fundamental traits. Nervous