Effects of chemoattractants are elicited via described or hypothetic chemotaxis receptors, the chemoattractant moiety of a ligand is target cell specific and concentration dependent.
Association studies, on the other hand, are more hypothetic and seek to verify whether a particular genetic variable really influences the phenotype of interest.
Apart from the tense markers mentioned, third person prefixes distinguish between present, past, hypothetic and imperative tenses, as will be seen below.
