A method including positioning a delivery device at a location in a vessel within a mammalian body, introducing a first treatment agent including a cellular component through the delivery device, and introducing a different second treatment agent disposed in a carrier through the delivery device. A method including identifying an infarct region within myocardial tissue and a border region of perfused tissue adjacent the infarct region, introducing a treatment agent including a cellular component to the border region, and introducing a plurality of microparticles to the infarct region. A kit including a treatment agent including a cellular component in a form suitable for percutaneous delivery, and a separate amount of a plurality of microparticles in a form suitable for percutaneous delivery.