Carbonic anhydrase 1 is an enzyme that in humans is encoded by the CA1 gene. Carbonic anhydrases are a large family of zinc metalloenzymes that catalyze the reversible hydration of carbon dioxide.
It is becoming more common that the latte macchiato will have a layer of milk foam on the top of the drink as well. A latte is steamed milk, espresso, and a 1/4 inch of foam ontop. It is prepared in this order: flavored syrup (if applicable), espresso, steamed milk, topped with 1/4 inch of foam.
The difference between a latte and a cappuccino is very simple, the shot of espresso is exactly the same. That doesn't change. It's the milk. For a latte the milk is not frothy although a tiny bit can be added to the top for decoration. A latte is a coffee beverage prepared with 1/4 espresso, 1/2 steamed milk, and 1/4 of milk foam on top. Flavors are also sometimes added. Latte = 2 shots + 8-10oz steamed milk + dollop of foam. A cappuccino is a coffee beverage prepared with 1/3 espresso, 1/3 steamed milk and a 1/3 milk foam.