time measurement datum age measurement datum In MageTab file, we use initialTimePoint (a process) + age (a number expected) + TimeUnit (definied in UO, such as year, hour, day, etc.) Now we use the term label indicating the start time point of measuring the age, (number + TimeUnit) are expected instances of the class note that we are currently defining subtypes of age measurement datum that specify when the age is relative to, e.g. planting, as we don't have adequate temporal predicates yet. life of bearer doesn't imply organism this assay measures time not developmental stage. we recognize that development can take different time periods under different conditions such as media / temperature age as a quality is dubious; we plan to revisit stages in development are currently handled with controlled vocabulary, such as 2-somite stage discussed on Nov 15, dev call All subtype will be defined by textual definition now. A time measurement datum that is the result of measurement of age of an organism MO_178 Age PERSON: Alan Ruttenberg, Chris Stoeckert, Jie Zheng age measurement datum