if you have your actors go into a real place of business you will need a Location Release The Location Release says that the owners give you permission to shoot on their property. The Filming Permit is a legal document generated by a governmental body (like the City of LA) that gives you permission to shoot a film in that city.
1 Bone marrow: the tissue in the middle of bones that creates red and white blood cells 2  ... Compact bone: the heaviest, hardest type of bone in the body. 3  Lining cell: flat cells that make up and cover the outer layer of bone. 4  Marrow: a soft tissue found inside bones. 5  Osteoblast: cells make new bone.
Leukocytes are not limited to blood. They occur elsewhere in the body as well, most notably in the spleen, liver, and lymph glands. Most are produced in our bone marrow from the same kind of stem cells that produce red blood cells. Others are produced in the thymus gland, which is at the base of the neck. Some white cells (called lymphocytes ) are the first responders for our immune system.