Exudates

Examples include naturally occurring yeasts on the skins of fruits and berries (such as grapes, apples, or peaches ), and exudates from plants (such as plant saps or cacti).

In addition, plants produce root exudates and other chemicals which manipulate their soil environment as well as their weed environment.

Pseudomembranes consist of a combination of inflammatory cells and exudates, and are loosely adherent to the conjunctiva, while true membranes are more tightly adherent and cannot be easily peeled away.

This beetle lives as a parasite both as a larva and as an adult, feeding on epidermal tissue and possibly on skin secretions and wound exudates.