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by SAGE Publications, Inc
by Richard H. Shryock
by Lynne Allen Leopold
by Donald Ray Belcher
by C. J. Coffee (PhD, Professor of Biochemistry, Department of MolecularGenetics and Biochemistry, University of Pittsburgh School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania)
by Andrew J. Fletcher (Temple University, Pennsylvania, USA); Lionel D. Edwards (Novartis and Pharam Pro Plus Inc, New Jersey, USA); Anthony W. Fox (EBD Group Inc, Carlsbad, California, USA); et al.
by Karageorghis, Vassos; Brennan, Terence P.; University of Pennsylvania University Museum
by Haverford College; Ashmead, Ann Harnwell; University of Pennsylvania University Museum