http://en.wikipedia.org/wiki/Chemotaxis
Chemotactic responses elicited by the ligand-receptor interactions are, in general, distinguished upon the optimal effective concentration(s) of the ligand. Nevertheless, correlation of the amplitude elicited and ratio of the responder cells compared to the total number are also characteristic features of the chemotactic signaling. Investigations of ligand families (e.g., amino acids or oligo peptides) proved that there is a fitting of ranges (amplitudes; number of responder cells) and chemotactic activities: Chemoattractant moiety is accompanied by wide ranges, whereas chemorepellent character by narrow ranges.
Chemotactic responses elicited by the ligand-receptor interactions are, in general, distinguished upon the optimal effective concentration(s) of the ligand. Nevertheless, correlation of the amplitude elicited and ratio of the responder cells compared to the total number are also characteristic features of the chemotactic signaling. Investigations of ligand families (e.g., amino acids or oligo peptides) proved that there is a fitting of ranges (amplitudes; number of responder cells) and chemotactic activities: Chemoattractant moiety is accompanied by wide ranges, whereas chemorepellent character by narrow ranges.
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