No, a mutation from GGU to CGU would not result in the same amino acid being specified.

Here's why:

* GGU codes for the amino acid Glycine (Gly).

* CGU codes for the amino acid Arginine (Arg).

Therefore, this mutation would lead to a missense mutation, where a single nucleotide change results in a different amino acid being incorporated into the protein. This can have a variety of effects on the protein's structure and function, depending on the specific location and nature of the change.