Table 1. Advantages and disadvantages of KGF-2 expression by different expression systems.

Expression system	Advantages	Disadvantages
Bacteria	Easy to manipulate	Poor folding capacity
	Low cost	Endotoxin accumulation
	High expression	Lack of post-translational modifications
	Short turnaround time
	Ease of scale up
Yeast	Easy to manipulate	The thick and hard cell walls
	High expression	Medium turnaround time
	Rapid growth and scalable	Low endotoxin content
	Simple culture conditions	Hyperglycosylation of proteins
	With post-translational modifications	Limited glycosylation capacity
Plant	Low cost	Low expression
	Optimized growth conditions	Long turnaround time
	Free from pathogen contaminants	Limited glycosylation capacity
	Free from bacterial toxin contaminants
	With post-translational modifications
	The oil body fusion strategy was used