The 69th JALAS (Japanese Association for Laboratory Animal Science) Meeting was held in Sendai City, Miyagi Pref. Five members made presentations at the meeting. *Symposium 2* Theme： The Golden Hamster： Revisited old animal models for new ideas Atsuo OGURA: Reproductive and developmental characteristics of the golden hamster and generation of knockout hamsters *LAS Seminar 3*　 Theme: Learn more, laboratory species! Michiko HIROSE: Cute, but so great, “hamster” *Poster Session* Kimiko INOUE：Elucidation of placenta-specific imprinted genes responsible for hyperplasia in somatic cell nuclear transferred placentas　 Ayumi HASEGAWA：Effects of superovulation treatment on pregnancy and strain differences　 Naomi WATANABE：An establishment and characterization of nuclear transfer embryonic stem cells from wild-derived mouse strains　

Dr. Kazuyuki OHBO and Ms. Kuniko NAKAJIMA (Histology and Cell Biology, Yokohama City Univ. Sch. Med.) visited our lab for a technical training of mouse IVF using poorly motile sperm.

On April 7, Dr. Kento Miura, Hiroshima University, came to our lab for a collaborative experiment to generate new mice cloned from T cells.

The FY2021 University of Tsukuba Research Presentation of SPRNG (Support for Pioneering Research Initiated by the Next Generation) was held hybrids. Mr. Daiki SHIKATA made presentation at the poster session. Title： Suppression of endogenous retrovirus ERVK in somatic cell nuclear transfer embryos

Dr. Hino visited our laboratory for collaborative experiments with Ogonuki-san. He analyzes chromosomes of spermatocyte-injected oocytes with multicolor FISH, which he originally developed for examination of the oocyte chromosome integrity.

The 114th SRD Meeting was held online. Four members made presentations at the poster session. *Poster Session* A. HASEGAWA: A novel superovulation method to obtain the maximum number of litters and its application to i-GONADO S. MATOBA: Optimization of somatic cell nuclear transfer technology in common marmosets D. SHIKATA: Transcriptome analysis of somatic cell nuclear transfer embryos with genomic plasticity derived from 129 strain K. MOCHIDA: Easy and quick (EQ) sperm freezing method for mouse strains without the use of liquid nitrogen, special reagents and special containers Mr. Daiki SHIKATA won the JRD Outstanding Paper Award (2020). Shikata et al. “H4K20 monomethylation inhibition causes loss of genomic integrity in mouse […]

Kimiko Inoue gave a web lecture for undergraduate students of the University of Tsukuba. Title: Basic Research of Reproductive Engineering Technologies and its applications in Laboratory Animals

The 68th Annual Meeting of JALAS was held online. Four members made presentations at the poster session. *Poster Session* K. MOCHIDA: Easy and quick (EQ) sperm freezing method for mouse strains. N. OGONUKI: Improvement of microinjection with primary spermatocytes. A. HASEGAWA: Newsuperovulation method for increasing litter size of C57BL/6J mice and its application to i-GONAD. N. WATANABE: An attempt to establish nuclear transfer Embryonic Stem Cells from wild-derived mouse strains.

Ms Naomi WATANABE Title： Establishment of nuclear transfer Embryonic Stem Cells from wild-derived mouse strains