T and B cells. Lymphocytes originate from stem cells in the bone marrow; these stem cells divide continuously, releasing immature lymphocytes into the bloodstream. Some of these cells travel to the thymus, where they multiply and differentiate into T lymphocytes, or T cells.
Cellophane is a thin, transparent sheet made of regenerated cellulose. Its low permeability to air, oils, greases, bacteria and water makes it useful for food packaging. Cellophane is in many countries a registered trade mark of Innovia Films Ltd based in Wigton, Cumbria, United Kingdom.
Cellophane is a plastic, foil-like material, like the Saran Wrap you would use to cover foods. It is made of Celluose fibers from wood, cotton, or hemp, which is dissolved in alkali and carbon disulfide, and then soaked in sulfuric acid and sodium sulfate. It is then bathed to remove the toxic sulfates, and put to use.