Extracellular membrane vesicles are fragments shed from plasma membranes off all cell types that are undergoing apoptosis or are being subjected to various types of stimulation or stress. Even in the process of programmed cell death (apoptosis). cell fall apart of varying size vesicles. They expose phosphatidylserine (PS) on the outer leaflet of their membrane. https://countryscenesaddleryandpetsuppliers.shop/product-category/bbs-dog-collar/