ANIMAL, ARTWORK, BODY, CELL, DEVELOPMENT, DIAGRAM, DIVISION, DNA, GAMETE, GAMETES, GAMETOGENESIS, GRAPHIC, GROWTH, HAPLOID, HEALTH, HUMAN, ILLUSTRATION, INFERTILITY, MALE, MAN, MITOSIS, NO-ONE, NOBODY, NORMAL, PHASE, PIKOVIT, PROCESS, PRODUCTION, REPRODUCTION, REPRODUCTIVE, SEMINIFEROUS, SERTOLI, SEXUAL, SPERM, SPERMATID, SPERMATOCYTE, SPERMATOGENESIS, SPERMATOGONIUM, SPERMATOZOA, SPERMATOZOID, SPERMATOZOON, STRUCTURE, SYSTEM, TUBULE,