ALJ The Community Center for Blood and Tissues of Asturias and the Federation of Blood Donors have organized two days in Pravia at the end of this month in which blood can be donated. The mobile unit will be installed on March 29 and 30 in the Plaza de Guadalhorce. The hours on both days will be from 9.15 to 14 hours, and in the afternoon blood can be donated between four and eight thirty.