10081
However , skin tumorigenesis in the experimental situation and in humans appears to follow common molecular mechanisms , even though there are species differences in the morphological correlates to the preneoplastic state .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None