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Sequencing of the index patients genomic DNA identified four new dominant mutations in COL2A1 that result in Kniest dysplasia a 21 - bp deletion in exon 16 , an 18 - bp deletion in exon 19 , and 4 - bp deletions in the splice donor sites of introns 14 and 20 .
 Kniest dysplasia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 Kniest dysplasia