The study found that smokers have higher concentrations of a gene known as MMP-1 in their skin. It produces a skin enzyme that breaks down collagen, the connective tissue which accounts for 70 per ...

MMP-13) and TIMPs (TIMP-1, TIMP-2, TIMP-3), and the housekeeping gene 18S. Data were compared using Mann Whitney U tests. Results Comparing patellar tendons from 3-year-old to 1-year-old rabbits, the ...