id	keyword
ct-9922	gene
ct-9922	pigs
ct-9922	livestock
ct-9922	crispr
ct-9922	cattle
ct-9922	system
ct-9922	cells
ct-9922	cas9
ct-9922	et al
ct-9922	dna
ct-9922	genome
ct-9922	production
ct-9922	editing
ct-9922	nat
ct-9922	zfns
ct-9922	sci