16756
We also discovered that crossbreeding the two CAM models ( double CAM alpha 1A / B - AR ) inhibited the development of hypertrophy and was reversible with single receptor activation , suggesting that coactivation of the receptors can lead to novel antagonistic signal transduction .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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