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Appreciable beta hexosaminidase A ( hex A ) activity has been detected in cultured skin fibroblasts and melanoma tissue from healthy individuals previously reported as having deficiency of hex A activity indistinguishable from that of patients with Tay - Sachs disease ( TSD ) .
 Disease: melanoma; Disease: deficiency of hex A; Disease: Tay - Sachs disease; Disease: TSD
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 Disease: melanoma; Disease: deficiency of hex A; Disease: Tay - Sachs disease; Disease: TSD