DEVELOPMENTAL BIOLOGY Correction for “Acrosin is essential for sperm penetration through the zona pellucida in hamsters,” by Michiko Hirose, Arata Honda, Helena Fulka, Miwa Tamura-Nakano, Shogo Matoba, Toshiko Tomishima, Keiji Mochida, Ayumi Hasegawa, Kiyoshi Nagashima, Kimiko Inoue, Masato Ohtsuka, Tadashi Baba, Ryuzo Yanagimachi, and Atsuo Ogura, which was first published January 21, 2020; 10.1073/pnas.1917595117 (Proc. Natl. Acad. Sci. U.S.A. 117, 2513–2518).
The authors note that on page 2517, left column, third full paragraph, line 25, “(500 V/cm, 50-ms duration, 5-ms intervals)” should instead appear as “(500 V/cm, 5-ms duration, 50-ms intervals).”