In molecular biology and/or genetic engineering, "Efficient Expressions" are molecular mechanisms or enzymatic processes that enable the production, replication, regulation, reparation and recombination of multiple substances and molecules, including proteins, and in lots of cases in the architecture and assembly of protein machinery.
Certain proteins are essential in all of the processes mentioned above when it comes to the develop of genetic information found in all living organisms. We are talking about "Genes".
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He had to toe the mark. Alice was really not unreasonable. She was just tidy and she didn't want to clean when she could prevent him from coming in with muddy shoes leaving dirt and grime all over the place, which she would later have to clean up.
I think she's thought out what she wants. He is trying to cooperate with her. Seems they have a pretty good relationship.
I hope this helps my guy :)