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Preparation of concentrated growth factor (CGF) glue. (a) Venous blood in vacuum glass tubes, (b) Centrifuge machine (MedifugeⓇ, Silfradent Srl, Forli, Italy) used for preparation of CGF glue, (c) Blood fractions just after centrifugation, (d) Middle layer (CGF glue) showing yellow glue with a small amount of red layer (buffy coat).
