Embryos were incubated with anti-Cathepsin L 1b (GeneTex, Inc.) at 4 °C overnight in PBST containing 5% sheep serum and washed 4 times with PBST. Subsequently, embryos were incubated with Alexa Fluor 594 goat anti-rabbit IgG (Invitrogen) at room temperature for 4 h in PBST containing 5% sheep serum and washed 4 times with PBST.
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