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Mining of channel catfish (Ictalurus punctatus) expressed sequence tag databases identified seven new novel immune type receptors (IpNITRs). These differed in sequence, but not structure, from previously described IpNITR1-11. IpNITR12a, 12b, 13, and 14 encode proteins containing a single variable (V)-like immunoglobulin (Ig) domain. IpNITR12a and 13 encode a transmembrane (TM) region and cytoplasmic...