1 The first two numbers indicate the alloy according the the chart below. 2  The last two numbers indicate the amount of carbon in the alloy, where the digits â10â, for example, represent 0.10% carbon. 3  the first two digits indicate this is plain carbon steel. The first two numbers indicate the alloy according the the chart below. 2  The last two numbers indicate the amount of carbon in the alloy, where the digits â10â, for example, represent 0.10% carbon. 3  the first two digits indicate this is plain carbon steel.
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Credit: UT Southwestern Medical Center. While investigating how the hormone orexin might control sleep and hunger, researchers at UT Southwestern Medical Center have discovered, to their surprise, that it activates a protein, HIF-1, long known to stimulate cancerous tumor growth.