Fact 1: Cartilage is a tough tissue that contains a protein called collagen.

Fact 2: Cartilage cells are called chondrocytes in mature cartilage.

Given the two facts above, answer the question "Chondrocytes contain which type of protein?" with the following options: 
- Actin
 - Keratin
 - white
 - allow growth
 - Collagen
 - ligt
 - positive
 - Hemoglobin


 

     Collagen    