Chicle is made from which part of Zapota tree?

NCERT (2025-26): “Hunting and Gathering … In modern times some gathering is market-oriented and has become commercial. Gatherers collect valuable plants such as leaves, barks of trees and medicinal plants and after simple processing sell the products in the market. They use various parts of the plants, for example, the bark is used for quinine, tanin extract and cork— leaves supply materials for beverages, drugs, cosmetics, fibres, thatch and fabrics; nuts for food and oils and tree trunk yield rubber, balata, gums and resins.

The name of the part of the chewing gum after the flavour is gone? It is called Chicle — it is made from the milky juice of zapota tree.”