Genotypes in matrix metalloproteinase 9 are a risk factor for COPD.

Int J Chron Obstruct Pulmon Dis · 2006 · PMC2707156 · PMID 18046864

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may be significantno p-value reported

This difference in the distribution of CA repeat length may be significant, because promoters with 21 CA repeats appeared to have a higher promoter activity compared with those with shorter repeats ( Shimajiri et al 1999 ).

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