TY JOUR TI SEARCH ASSOCIATION OF POLYMORPHISM rs3918242 IN MMP9 GENE WITH GUM RECESSION OF CHILDREN KW children KW buccal epithelium KW DNA KW rs3918242 polymorphism of the MMP9 gene KW gum recession JO Actual problems in dentistry AU Akisheva, A.R. AU Valeeva, I.K. AU Mamaeva, E.V. AU Valeeva, E.V. AU Akhtereeva, A.R. AU Akhmetov, I.I. PY 2021 IS 17 PB TIRAZH Publishing House