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Journal of Reproduction and Fertility|July 1, 1993
Maturation-promoting factor (MPF) is responsible for the transformation of sperm nuclei to metaphase chromosomes in maturing bovine oocytes in vitroL R Abeydeera, K Niwa, K OkudaTAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik|November 14, 2013
Cytological analysis of tetraploid hybrids between sweet potato and diploid Ipomoea trifida (H. B. K.) DonM Z Oracion, K Niwa, I ShiotaniJournal of Reproduction and Fertility|July 1, 1989
Penetration of bovine follicular oocytes by frozen-thawed spermatozoa in the presence of caffeine and heparinC K Park, O Ohgoda, K NiwaJournal of Reproduction and Fertility|September 1, 1992
Effect of sperm penetration in vitro on completion of first meiosis by bovine oocytes arrested at various stages in cultureR C Chian, K Niwa, H NakaharaJournal of Reproduction and Fertility|November 1, 1991
In-vitro penetration of pig oocytes matured in culture by frozen-thawed ejaculated spermatozoaW H Wang, K Niwa, K OkudaTheriogenology|February 5, 2003
Vitrification of rat embryos at various developmental stagesM-S Han, K Niwa, M KasaiJournal of Reproduction and Fertility|January 1, 1991
Penetration in vitro of bovine oocytes during maturation by frozen-thawed spermatozoaK Niwa, C K Park, K OkudaTheriogenology|August 1, 1991
In vitro penetration of zona pellucida of salt-stored bovine oocytes before and after maturation by frozen-thawed spermatozoaR C Chian, K Niwa, K OkudaZygote (Cambridge, England)|November 1, 1994
Activation of bovine oocytes penetrated after germinal vesicle breakdownL R Abeydeera, K Okuda, K NiwaKaibogaku Zasshi. Journal of Anatomy|June 9, 1998
[Morphological basis on periodontal Ruffini endings]T Maeda, H OhshimaPageof 169