They later fuse , and , under the influence of the surrounding mesenchyme , the mature organ develops , being mainly composed of ductal , exocrine and endocrine compartments .
they later fuse , and , under the influence of the surrounding mesenchyme , the mature organ develops , being mainly composed of ductal , exocrine and endocrine compartments .
O O O O O O O O O O O O B-tissue O O B-body_part I-body_part O O O O O O O O O O O O O