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