الفهرس 
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Abstract
The aim of the present study is to investigate the effect of soft tissue
hyaluronic acid injectable filler on the:
1- histological features of buccal mucosa of rabbits over a period of three
months.
2- regulation of angiogenesis through the expression of Vascular
Endothelial Growth Factor (VEGF).
3- expression of Fas antigen to evaluate the apoptotic changes.