3460
The [ ( 3 ) H ] PGE ( 2 ) binding of W203A in broken cell membrane fractions was inhibited by addition of GTP gamma S ( IC ( 50 ) 21 +/- 1 . 8 nM ) .
 Chemical: [ ( 3 ) H ] PGE ( 2 ); Chemical: GTP gamma S
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: [ ( 3 ) H ] PGE ( 2 ); Chemical: GTP gamma S