APPRIS P2: Where the APPRIS core modules are unable to choose a clear principal variant (approximately 25% of human protein coding genes), the database chooses two or more of the CDS variants as "candidates" to be the principal variant.

APPRIS is a system to annotate alternatively spliced transcripts based on a range of computational methods to identify the most functionally important transcript(s) of a gene.

APPRIS ALT2: For genes in which the APPRIS core modules are unable to choose a clear principal isoform, the ALT1 is the candidate transcript(s) models that appear to be conserved in fewer than three tested species.

APPRIS is a system to annotate alternatively spliced transcripts based on a range of computational methods to identify the most functionally important transcript(s) of a gene.