The appearance of type III interferon due to biosynthesis or secretion following a cellular stimulus, resulting in an increase in its intracellular or extracellular levels. Interferon lambda is the only member of the type III interferon found so far.
Comment:
Note that IL-28A, IL-28B, and IL-29 are types of interferon-lambda. This term is in the subset of terms that should not be used for direct gene product annotation. Instead, select one of the 'regulation' children terms.