THE CRYSTAL STRUCTURE OF AN ARCHAEAL CPSF SUBUNIT, PH1404 FROM PYROCOCCUS HORIKOSHII 3AF5 HYDROLASE, ARCHAEAL CPSF, BETA-CASP FAMILY, KH DOMAIN, RIBONUCLEASE, METALLO- BETA-LACTAMASE SUPERFAMILY, PYROCOCCUS HORIKOSHII, ARCHAEA