Histone preparations from yeast nuclei. (A) Coomassie staining of fractions from various stages of purification. Lane 1, whole cell extract; lane 2, band in Percoll gradient; lane 3, nuclear pellet; lane 4, acid extraction of nuclear pellet; lane 5, marker (mol. wt 220, 97.4, 66, 46, 30 21.5 and 14.3 kDa, respectively); lane 6, HHO1–2HA; lane 7, wild-type; lane 8, hho1::HIS3. The putative HHO1p band is present in the wild-type but not in hho1::HIS3 and has a higher molecular weight in the HHO1–2HA lane. (B) Western analysis of (A) with anti-HA antibody.