Biochemistry. In the article ''Identification by mass spectrometry of the phosphorylated residue responsible for activation of the catalytic domain of myosin I heavy chain kinase, a member of the PAK͞STE20 family'' by Joanna Szczepanowska, Xiaolong Zhang, Christopher J. Herring, Jun Qin, Edward D. Korn, and Hanna Brzeska, which appeared in number 16, August 5, 1997, of Proc. Natl. Acad. Sci. USA (94,(8503)(8504)(8505)(8506)(8507)(8508), the authors wish to note that in Fig. 3, the ions of m͞z 1345.3 and 1247.1 were incorrectly identified as b 13 and b 13 ⌬ , respectively, produced by cleavage of the peptide AS(Pi)VVGTTYW-MAPEVVK between E and V (Fig. 3 Inset). In fact, these ions are b 12 and b 12 ⌬ , produced by cleavage of the peptide between P and E. This correction has no effect on the conclusion that the phosphorylated residue is serine. Also, in Table 2, reference numbers 22-24 should be 21-23 (the reference in the legend is cited correctly) and the MIHCK sequence is from residue 624 to residue 638.Cell Biology. In the article ''Subtraction hybridization identifies a transformation progression-associated gene PEG-3 with sequence homology to a growth arrest and DNA damageinducible gene'' by Zao

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C(60), vitamin E, and three C(60) derivatives (polar 1 and water-soluble C(3)/D(3)C(60)s) were examined for their antioxidant effects on prevention of lipid peroxidation induced by superoxide and hydroxyl radicals. The protection effect on lipid peroxidation was found to be in the sequence: C(60) >/= vitamin E > 1 > none, for liposoluble antioxidants, and C(3)C(60) >> D(3)C(60) > none, for water-soluble ones. Fluorescence quenching of PyCH(2)COOH (Py = pyrene) by both C(3)- and D(3)C(60)s shows that the Stern-Volmer constant, K(SV), is about the same for both quenchers in aqueous solution. Upon addition of liposomes, the fluorescence quenching becomes more efficient: 5-fold higher in K(SV) for C(3)C(60) than for D(3)C(60). When Py(CH(2))(n)()COOH (n = 1, 3, 5, 9, or 15) was incorporated in lipid membranes, the K(SV)s all were small and nearly equal for D(3)C(60) but were quite large and different for C(3)C(60) with the sequence: n = 1 < 3 < 5 < 9 < 15. The better protection effect of C(3)C(60) on lipid peroxidation than that of D(3)C(60) is attributed to its stronger interaction with membranes. Overall, the antioxidation abilities of the compounds examined were rationalized in terms of the number of reactive sites, the location of antioxidant in lipid membranes, and the strength of interactions between antioxidants and membranes.