Histologically, the islets consist of three major and at least two minor cell types.
Beta cells, which synthesize and secrete insulin, make up about 60% of a typical islet.
Alpha cells are the source of glucagon, 30% of islet tissue.
Delta cell, which are less abundant, produce somatostatin.
F cells, which secrete pancreatic polypeptide.
Fifth cell type that secretes ghrelin.
Fifty cell typ
5.Ti (tumour inducing) plasmid
Agrobacterium 에서 Ti plasmid의 T-DNA가 식물 genome에 삽입되어 종양 만듬.
Virulence (vir) region
: T-DNA를 식물 chromosome으로 전달하는
필수 단백질을 coding함.
- T-DNA(transfer DNA)
: 식물 chromosome에 옮겨지는 부분
-left border (LB)
-right border (RB)
-opine biosynthesis genes
: o