COPI

COPI (Coat Protein I) is a type of protein coat that helps transport materials within cells. It forms a structure around certain packages, called vesicles, that carry proteins and other molecules from the Golgi apparatus back to the endoplasmic reticulum (ER). This process is crucial for recycling cell components and maintaining proper cell function. Think of COPI as a delivery system that selectively retrieves and recycles materials within the cell, ensuring everything stays organized and operates smoothly.