6165
Most importantly , while enamel thickness was not affected in either mouse model , the calcium content within the enamel phase was significantly reduced in oc / oc , but not in Src ( - / - ) or Hyp ( - / 0 ) mice .
 calcium
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 calcium