1708
The deleted nucleotide sequence corresponded to sequences that , by analogy to the organization of the type I collagen genes , should be precisely encoded by exon 41 of the COL3A1 gene .
 type I collagen genes, COL3A1 gene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 type I collagen genes, COL3A1 gene