cell surface receptors
"Cell-surface receptors are like traffic cops. . . . Without the appropriate signals entering and exiting the stem cell, it does not know whether to selfrenew..."
The rest is in the link....
"Cell-surface receptors are like radiowave antennae: They pick up signals to send them forward to the appropriate cellular equipment that process the information in the signals. But how do cells know where to best position receptors to cleanly and efficiently pick up the numerous signals coming at them? "
A paper on how cells organize the receptors on their outer surfaces...
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