Remembering Dr. Ryuzo Yanagimachi: A lifelong journey in reproductive science.

Dr. Ryuzo Yanagimachi, a renowned figure in reproductive science, passed away in September 2023 at the age of 95. The author of the article shares their personal encounters with Dr. Yanagimachi, including collaborations and mentorship. Dr. Yanagimachi's contributions to the field include breakthrough findings and technologies related to sperm capacitation, intracytoplasmic sperm injection, and mouse cloning. His enduring curiosity in fish fertilization and commitment to collaborative projects and advisory roles made a lasting impact on the author and many others in the field. Dr. Yanagimachi's legacy will continue to inspire future reproductive biologists. [Extracted from the article]