is a protein that when associated
with actin produces a muscular
contraction. is a membrane protein
of some lymphocytes, the cells that are
infected by HIV. is an energy
storage protein and also an important
regulator of the blood osmolarity.

is a protein with structural function
present in the epidermis and
skin appendages of vertebrates.
are the antibodies,
specific proteins that attack and
inactivate strange agents that enter the
body. is the
enzyme responsible for the transcription
of RNA and formation of DNA in the life
cycle of retroviruses. is the
protein that carries oxygen from the
lungs to the cells. is a hormone
secreted by the pancreas that
participates in the metabolism of
glucose.