Monoclonal antibodies to treat cancer. One way the immune system attacks foreign substances in the body is by making large numbers of antibodies. An antibody is a protein that sticks to a specific protein called an antigen.Antibodies circulate throughout the body until they find and attach to the antigen.ne way the immune system attacks foreign substances in the body is by making large numbers of antibodies. An antibody is a protein that sticks to a specific protein called an antigen. Antibodies circulate throughout the body until they find and attach to the antigen.
The average weight is 6 to 10 pounds, but king crab can grow to more than 20 pounds. Unlike other crabs, king crabs have only six legs versus eight legs, and two claws. The body or carapace section of king crabs is typically sent to canners while the legs are separated and served individually.
Appearance: Horseshoe crabs grow to two feet in length. They have a hard, rounded, brownish-green exoskeleton, a spike-like tail and five pairs of jointed legs. Their widely spaced eyes look like bumps on the top of their shell.Their gills have folds of membranes that look like the leaves of a book. Just like other arthropods, horseshoe crabs must molt to grow. 2  They leave their old shells behind and grow a new, larger shell. 3  Horseshoe crabs swim upside down and can survive out of the water for an extended period of time if their gills are kept moist.