english: They initially circulate  in the recipient’s peripheral bloodstream, but molecules on the stem cells,  called chemokines, act as homing devices and quickly traffic them  back to the marrow.
non_english: One u početku cirkulišu u perifernom krvotoku primaoca, ali hemokini, molekuli na matičnim ćelijama, deluju kao uređaji za navođenje i brzo vode krvne ćelije nazad u srž.