Summary
The eggs of a sea hare,Aplysia kurodai, contained antibacterial factors which probably play a role in the defense of eggs against bacterial infection. The active factors were composed of several heat-labile proteins, unrelated to lysozyme, and were produced in the albumen gland.
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Kamiya, H., Muramoto, K. & Ogata, K. Antibacterial activity in the egg mass of a sea hare. Experientia 40, 947–949 (1984). https://doi.org/10.1007/BF01946452
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DOI: https://doi.org/10.1007/BF01946452