CROC4 is an alias for the gene, Chromosome 1 open reading frame 61, in humans. Other names include: Protein CROC-4; Contingent replication of cDNA 4; contingent replication of cDNA-4; transcriptional activator of the c fos promoter. The encoded protein has an amino acid length of 156 and a mass of 17.2 kDa. Other isoforms may exist.