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First , we examined the expression of genes encoding proteins associated with progesterone biosynthesis : steroidogenic acute regulatory protein ( STAR ) ; a side chain cleavage enzyme ( CYP11A1 ) ; and 3 beta - hydroxysteroid dehydrogenase / ketosteroid isomerase ( HSD3B ) .
 Chemical: progesterone; Chemical: 3 beta - hydroxysteroid; Chemical: ketosteroid
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: progesterone; Chemical: 3 beta - hydroxysteroid; Chemical: ketosteroid