Gene expression profile Sequence tag profile Sequence tag profile (with gene assignment) Output from a serial analysis of gene expression (SAGE), massively parallel signature sequencing (MPSS) or sequencing by synthesis (SBS) experiment. In all cases this is a list of short sequence tags and the number of times it is observed. SAGE, MPSS and SBS experiments are usually performed to study gene expression. The sequence tags are typically subsequently annotated (after a database search) with the mRNA (and therefore gene) the tag was extracted from. beta12orEarlier This includes tag to gene assignments (tag mapping) of SAGE, MPSS and SBS data. Typically this is the sequencing-based expression profile annotated with gene identifiers. Sequencing-based expression profile