Figures 338 (upper) and 339 (lower) from Chapter 14 (Sperm Flagellum) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Transverse sections through midpiece and principal piece of several sperm from the newt, Notophthalmos viridescens. (From Fawcett, Biol. Reprod. [Supp. 2, 90-127, 1970.]) A PDF copy of the accompanying chapter is available on the ASCB’s BioEDUCATE website.
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