Abstract
To the Editor: β-Mannosidosis is a recently described inherited disorder of glycoprotein catabolism in goats.1 We would like to report a deficiency of acid β-mannosidase activity in plasma, leukocytes, and cultured skin fibroblasts from an Indian Hindu man with mental retardation, whose parents were not related.The patient was born at full term; the delivery was normal, with no neonatal complications. Walking and speech developed normally, but when the patient began to attend school at the age of five years, impaired intellectual development was observed. Clinical assessment at the age of 44 years revealed mental retardation, but there were no . . .

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