The business environment for foreign companies in China can be summed up in one word, challenging.

Here the full Wall Street Journal series, the state of Xi's Chinese dream, all in one place,

and WSJ special access, only for subscribers and only on Spotify.

The neurons in your brain, bacteria that causes strep throat, and the roots of a 500-year-old redwood tree.

What do they all have in common? They're all made of cells.

But as fundamental as the cell is to our world and to our biology,

it's taken scientists hundreds of years to understand it.

And what they've discovered has huge implications for medicine.

Instead of just looking to treat organs or parts of the body, doctors are figuring out how to alter individual cells.

That means treatments for diseases like diabetes and cancer that have long puzzled scientists.

They could be about to crack wide open.

We're entering a kind of new age of medicine, in which the cell becomes the unit of therapy and potentially, you know, you can manipulate it.

From the Wall Street Journal, this is the future of everything.

I'm Alex Osella.

Today, we speak with the Cancer Physician and Science Writer, Dr. Siddhartha Mukherjee.

His latest book, The Song of the Cell, is all about how this new understanding of cells could lead to future medical breakthroughs.

Fixing our cells, or someday, even enhancing them. Stay tuned.

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