realizes has specified input has specified output role of has role evaluant role assay age determination assay age measurement assay This assay measures time not developmental stage. we recognize that development takes different time periods under different conditions such as media / temperature. For example, age measurement assay of fly age, the output likes 28 days but not mid-life of age at room temperature. Alan Ruttenberg An assay that determines the duration of part of the life of an organism, where the initial time point is the beginning of some transitional state (such as birth or when planted). age determination assay OBI group age measurement datum organism metadata complete