Blood
Unlike mammals, horseshoe crabs do not have hemoglobin in their blood, but instead use hemocyanin to carry oxygen. Because of the copper present in hemocyanin, their blood is blue. Their blood contains amebocytes, which play a role similar to white blood cells for vertebrates in defending the organism against pathogens. Amebocytes from the blood of L. polyphemus are used to make Limulus amebocyte lysate, which is used for the detection of bacterial endotoxins.
Harvesting horseshoe crab blood involves collecting and bleeding the animals, and then releasing them back into the sea. Most of the animals survive the process; mortality is correlated with both the amount of blood extracted from an individual animal, and the stress experienced during handling and transportation. Estimates of mortality rates following blood harvesting vary from 3% to 15%.
Read more about this topic: Horseshoe Crab
Famous quotes containing the word blood:
“I was born upon thy bank, river,
My blood flows in thy stream,
And thou meanderest forever
At the bottom of my dream.”
—Henry David Thoreau (1817–1862)
“The land cannot be cleansed of the blood that is shed therein, but by the blood of him that shed it.”
—Bible: Hebrew Numbers 35:33.
“At stroke of midnight soul cannot endure
A bodily or mental furniture.
What can she take until her Master give!
Where can she look until He make the show!
What can she know until He bid her know!
How can she live till in her blood He live!”
—William Butler Yeats (1865–1939)