With regard to the maturation of an erythrocyte [ih-RITH-ruh-syt], arrange the following four choices in correct sequence starting with the cell type after the proerythroblast [proh-i-RITH-ruh-blast] and ending with the mature erythrocyte: 1) Basophilic [bay-suh-FIL-ik] erythroblast, 2) Reticulocyte [ri-TIK-yoo-luh-syt], 3) Orthochromatic [ohr-thuh-kroh-MAT-ik] normoblast, 4) Polychromatophilic [poh-lee-kroh-muh-tuh-fil-ik] erythroblast.