Are all genetic mutations harmful?

A single mutation can have a large effect, but in many cases, evolutionary change is based on the accumulation of many mutations with small effects. Mutational effects can be beneficial, harmful, or neutral, depending on their context or location. Most non-neutral mutations are deleterious.

This hormone was made by a different cell, and it’s now being taken in by another cell using a steroid receptor. The steroid receptor is affecting the process of transcription in the nucleus so that a specific type of mRNA can exit the cell and form a new protein in the ribosomes. This formation wouldn’t be possible unless specialized cells were working together to perform this function.