Positive test controls include: MCF7. Immunogen sequence: MIPFLPMFSL LLLLIVNPIN ANNHYDKILA HSRIRGRDQG PNVCALQQIL GTKKKYFSTC KNWYKKSICG QKTTVLYECC PGYMRMEGMK GCPAVLPIDH. Periostin (PN), also designated osteoblast-specific factor 2 (OSF-2), is a disulfide