High level of expression in the mixed-stage embryonic population. Present at low levels in pregastrulation embryo stage. Present in all larval stages at low levels decreasing progressively with age.
Under standard growth conditions, green fluorescence was undetectable at low magnification (25x) and was detected at a very low level throughout the intestine at high magnification (200x) in the majority of adult animals.
flp-18 expression reporter was strongly expressed in several head neurons and was detectable at low levels in the ventral nerve cord. The expression of flp-18 was generally low in the cholinergic motor neurons.