PBS (−) was dissolved in 0.8% (w/v)
NaCl (Fujifilm Wako Chemicals), 0.02% (w/v)
KCl (Nacalai Tesque), 0.28% (w/v) NaHPO
4·12H
2O (Nacalai Tesque), 0.02% (w/v) KH
2PO
4 (Nacalai Tesque), and ultrapure water. PBS (+) was dissolved in 0.1% (w/v) CaCl
2 (Hayashi Pure Chemical Ind., Ltd), 0.1% (w/v) MgCl
2·6H
2O (Katayama Chemical Industries Co, Ltd), 1% (w/v)
glucose (Nacalai Tesque), and ultrapure water. PBS was dissolved in 9% (v/v) PBS (−), 10% (v/v) PBS (+), 1% (v/v) PVP (Sigma‐Aldrich), 0.2% (v/v)
penicillin streptomycin (Nacalai Tesque), and ultrapure water. Modified NCSU37 (mNCSU37) medium was used as basic medium for pre‐IVM and IVM of porcine COCs.
5,
23,
24 Highly purified FSH was a kind gift from the National Hormone and Pituitary Program (National Institute of Diabetes, Digestive and Kidney Diseases; NIDDK).
Hypoxanthine (Sigma‐Aldrich) was dissolved in the mNCSU37.
Holo‐TF (monoferric or diferric TF; T8158) and Apo‐TF (non‐iron bond TF;
T2252) were purchased for Sigma‐Aldrich and were dissolved in the mNCSU37.
Fetal calf serum (FCS) was purchased from Invitrogen.
Tonai S., Nakanishi T., Yamaoka M., Okamoto A., Shimada M, & Yamashita Y. (2023). Pre‐culture with transferrin‐Fe3+ before in vitro maturation improves the developmental competence of porcine oocytes matured in vitro. Reproductive Medicine and Biology, 22(1), e12529.