Summary. A preliminary study of acidic a-glucosidase in a variety of tissues was carried out in an attempt to develop a test which might be used to detect individuals heterozygous for the genetype associated with generalized glycoeenosis in beef Shorthorn cattle. Of the tissues readilv available Deri~heral bmphocytes were chosen as being likely to be the most suitable. 1t-wab concluded that, when coupled with genealogical information, assays of a-glucosidase in extracts of lymphocytes were useful for identifying heterozygous individuals with a reasonably high degree of probability.

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