These genes were assessed and ranked by cartilage selectivity with whole-genome microarray data , revealing only two genes , encoding aggrecan and chondroitin sulfate proteoglycan 4 , that were selectively expressed in cartilage .
O O O O O O O O O O O O O O O O O O O O B-GeneOrGeneProduct O B-GeneOrGeneProduct I-GeneOrGeneProduct I-GeneOrGeneProduct I-GeneOrGeneProduct O O O O O O O O