Chorion

[Yiing Lin]

Hello,

I was wondering if there's anything I can add to the water that zfish 
eggs are in to soften the chorion.  At about the 4-cell stage, the 
chorion gets really tough for me and my injection tips can't penetrate 
them.

Thanks in advance!

						-Yiing LIn
						 ylin at acpub.duke.edu