533
The rate of collagen synthesis in normal scar was approximately constant between 6 months and 20 years after the initial wounding , but in both hypertrophic scar and keloid the rate was initially approximately twice that in normal scar , and 2 - 3 years after wounding it fell to approximately the same level as in normal scar .
 GENE: collagen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: collagen