Possible molecular chaperone; assists the folding of proteins upon ATP hydrolysis. Presence of two highly similar CCT8L genes (CCT8L1P and CCT8L2) in the genomes of human and chimp and of a single copy in other mammal genomes, including rhesus monkey, suggests that the duplication of this gene occurred in the ape lineage (Hominoidea) after its divergence from the old-world monkeys (Cercopithecidae). Expression of CCT8L2 is confirmed by many ESTs mostly identified from the testis. Belongs to the TCP-1 chaperonin family. Contaminating sequence. Sequence of unknown origin in the C-terminal part.