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Background: p24 family proteins function as cargo receptors for ER-Golgi transport. Results: Genetic and physical interactions among eight known and one newly identified S. cerevisiae p24 proteins were determined. Conclusion: Yeast p24 proteins function in several functionally redundant complexes, including one containing a novel p24 isoform induced under respiratory conditions. Significance: This is the first comprehensive study of the yeast p24 complexes.