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A man's expression can take forms such as music, art, ect.
The expression "Dig your own grave" is a metaphor which means to get one's self into trouble that they may not be able to get out of, something foolish or dangerous.
Many are motivated to get a nipple piercing for personal reasons including for self-expression and to feel unique.
A cloning vector that contains a highlhy active prokaryotic promoter just upstream of a restriction site where the eurkaryotic gene can be inserted in the correct reading frame. Such expression vectors allow the synthesis of many eukaryotic proteins in bacterial cells.