22877
Those include dwarfism , constitutive ERK1 / 2 activation , strongly reduced Ihh expression and decreased chondrocyte proliferation and maturation , increased chondrocytic expression of Rankl , matrix metalloproteinase 9 ( Mmp9 ) and Mmp13 and enhanced growth plate osteoclastogenesis , as well as increased sensitivity to caspase - 9 mediated apoptosis .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None