This spongy tissue serves as a source of calcium for eggshell formation.
这种海绵状组织是形成蛋壳的钙质来源。
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The cells are "the first unlimited source of any type of human tissue, " says Thomson, who founded Cellular Dynamics to put stem cells to practical use.
The cells are "the first unlimited source of any type of human tissue," says Thomson, who founded Cellular Dynamics to put stem cells to practical use.