We accept the dozens of different apple varieties or nitpick between our favorite lettuce greens, yet when it comes to our workhorse citrus fruit, a lemon is just supposed to be a lemon.

It adds a refreshing taste to cocktails and even desserts. This lemon is not all yellow. It has a rosy-hued interior and a sweeter taste than regular lemons. It's perfect for lemonade and desserts.

This knowledge gap presents challenges for both breeding improved lemon varieties and understanding the fundamental biological processes driving fruit development. Addressing these gaps ...