Slit pores are formed by the epithelial cells of

Slit pores are actually formed by the specialized cells known as podocytes, which are part of Bowman's capsule in the renal corpuscle of the nephron.

Podocytes are unique epithelial cells with elaborate branching extensions called foot processes. These foot processes pedicels, interdigitate with each other and wrap around the glomerular capillaries to form a filtration barrier. The gaps between the foot processes create small spaces known as filtration slits or slit pores. These slits allow for the passage of water, ions, glucose, amino acids, and other small molecules from the glomerular capillaries into Bowman's capsule, forming the initial filtrate that will eventually become urine.

The structure of the podocytes and the filtration slits they create are crucial for the selective filtration of blood in the renal corpuscle, ensuring that only certain substances are allowed to pass into the nephron while larger molecules like proteins are retained in the blood.