ChickGenome editing in chickens can be difficult, due to accessibility of the zygote, compared to other organisms6. Oishi et al perform genome editing in chicken using the CRISPR-Cas9 system6. Using the CRISPR-Cas9 system, the team targeted two egg white genes ovalbumin (OVA) and ovomucoid (OVM) in cultured chicken primordial germ cells (PGCs) 6. They used Sanger sequencing to analyze off-target mutations and mutated OVM and OVA genes following genome editing in the targeted PGCs6. The mutant-PGCs were then transplanted into chicken embryos and the team was able to successfully generate OVM mutant chickens6.