You have a protein of unknown function and would like to discern whether or not this protein is secreted from the cell in a regulated or a constitutive manner. You also have all of the experimental reagents and expertise you would need to perform any experiment. Design a set of experiments to determine whether this protein is secreted from the cell, and if so, if this secretion is regulated or constitutive. Based on your theoretical findings of these experiments, propose a possible function for the unknown protein.