Single cells of CD34⁺38⁺DR⁺(represented as +) and CD34⁺38⁻DR⁺ (represented as −) phenotypes were deposited into single U-shaped wells into serum-free medium and standard growth factors. The wells had been precoated with H120, H0, or BSA or left uncoated. The figure shows the mean number of wells (n = 2,3, or 4) ± SD in which a migratory pattern was seen expressed as a percentage of the result with H120 at week 1 for the CD34⁺38⁺DR⁺ (+) phenotype. Migration was defined as movement of cells against gravity up and around the sides of the wells.