Ying: Different Classes of Proteins

Fibroin, a structural protein, can be found in the silk fibers spun by spiders to build their webs
American House Spider (Parasteatoda tepidariorum)
[42.280059,-71.588902]

*Prolamins are a type of storage protein found in plant seeds,
such as those held in these seed pods of the
Common Milkweed (Asclepias syriaca)
[42.258213,-71.59736]

Hemoglobin, a transport protein, can be found in the blood of vertebrates
such as this Wild Turkey (Meleagris gallopavo)
[42.064372,-71.586906]

Insulin, a hormonal protein, regulates blood sugar levels and is found in the bodies of
vertebrates such as this White-Tailed Deer (Odocoileus virginianus)
[native to the forests of Massachusetts]
http://animals.nationalgeographic.com/animals/mammals/white-tailed-deer/

Actin and myosin, contractile and motor proteins, can be found in the muscles of this
Northern Green Frog (Rana clamitans melanota)
[42.236715,-71.630839]

Sources:  *Hojilla-Evangelista, Mila P., Roque L. Evangelista, and Victor Wu. "Characterization of Milkweed (Asclepias Spp.) Seed Proteins." N.p., n.d. Web. 5 Sept. 2012. <http://naldc.nal.usda.gov/download/28237/PDF>.