Signal peptide-induced sensory behavior in free ciliates: bioassays and cellular mechanisms.

Cellular chemosensory and other kinds of behavior of protozoa can be considered a fundamental aspect of cellular activity equivalent to cellular growth and sexual reproduction. For motile protozoan cells, the type of chemicals which act as attractants and repellents in natural environments probably reflects the ecological niches which a particular organism selects as its favorite environment, in particular when it has to coexist with other organisms and still survive and maintain its identity. The different chemical stimuli signify the presence of food, mates, toxic conditions, hosts, etc.

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