Polysaccharide of moving animals. Cellulose and chitin are examples of structural polysaccharides. Cellulose is used in the cell walls of plants and other organisms, and is said to be the most abundant organic molecule on Earth. It has many uses such as a significant role in the paper and textile industries, and is used as a feedstock for the production of rayon (via the viscose process), cellulose acetate, celluloid, and nitrocellulose. Chitin has a similar structure, but has nitrogen-containing side branches, increasing its strength. It is found in arthropod exoskeletons and in the cell walls of some fungi. It also has
Doctor of Pharmacy holders to pursue an academic career by enrolling masters and doctorates programs (MSc and PhD) in several scientific fields (pharmaceutical technology, pharmacokinetics and biopharmaceutics, biomedical sciences, cosmetics & pharmaceutical industry, pharmaceutical and organic chemistry, physical chemistry, food sciences, pharmacology, toxicology, public health, etc.). Masters usually lasts 1–2 years and PhD's no less than 4 years. In summary, in Spain an entry-level pharmacy degree lasts 5 years and a "Hospital Pharmacy Specialist" needs 9.5 years of education and/or training. Hospital Pharmacy Residents are paid during their residency period. There are other residencies available to pharmacists such as Medical Biology, Clinical Biochemistry,