Question: the lack of stability and structural integrity of l-prf in biological environments is a major limitation in its use in tissue engineering.
Answer: --> The lack of stability and structural integrity of L-PRF in biological environments is a major limitation in its use in tissue engineering.

Question: a look at the youtube channel is always worthwhile.
Answer: --> A look at the YouTube channel is always worthwhile.

Question: violet coloured contacts with 1 tone
Answer:
--> Violet coloured contacts with 1 tone