Now we have an idea about how much we don’t know about human biology — lots.

In recent years we’ve learned that interactions among proteins are fundamental to how our bodies function. It looks like there are about 650,000 protein interactions. The interactions we’ve identified make up less than 3/10 of a percent. Put another way, we haven’t identified 99.7 percent of the protein interactions that happened in our bodies.

This sure gives me pause. Are your kids studying hard to become biologists?

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