[Xenopus] Problems with HCG

[Richard Harland]

Dear Xeno(pus)philes
We recently switched to using Sigma HCG, and have had very unreliable and late ovulations.  Is this a general issue with Sigma HCG?  Or might this be a bad batch? 
Previously we used Chorulon, during an ordering problem, which fortunately has been overcome.
Richard Harland

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