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To gain a better understanding of the molecular actions of tocopherols and examine the link among vitamin E , somatostatin and neuronal survival , we have investigated the effects of a deficiency and subsequent administration of tocopherol on the somatostatin signaling pathway and neuronal survival in the rat hippocampus .
 Chemical: tocopherols; Chemical: vitamin E; Chemical: somatostatin; Chemical: tocopherol; Chemical: somatostatin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: tocopherols; Chemical: vitamin E; Chemical: somatostatin; Chemical: tocopherol; Chemical: somatostatin