1980. Rheins, L.A., R.D. Karp and A. Butz. Induction of specific humoral immunity to soluble proteins in the American cockroach (Periplaneta americana). I. Nature of the primary response. Dev. Comp. Immunol. 4:447-458.

1980. Karp, R.D. and L.A. Rheins. Induction of specific humoral immunity to soluble proteins in the American cockroach (Periplaneta americana). II. Nature of the secondary response. Dev. Comp. Immunol. 4:629-639.

1980. Karp, R.D. and L.A. Rheins. A humoral response of the American cockroach to honeybee toxin demonstrating specificity and memory. In: Evolution of Immunologic Memory (M. Manning, ed.). North-Holland Publishing Co., New York. pp. 65-76.

1982. Rheins, L.A. and R.D. Karp. Cockroach inducible humoral factor: Precipitin activity that is sensitive to a proteolytic enzyme. J. Invert. Pathol. 40:190-196.

1983. Varadarajan, J. and R.D. Karp. Histological versus morphological assessment of graft rejection in invertebrates. Transplantation 35:629-631.

1984. George, J.F., R.D. Karp and L.A. Rheins. Primary integumentary xenograft reactivity in the American cockroach, Periplaneta americana. Transplantation 34:478-484.

1984. Rheins, L.A. and R.D. Karp. The humoral immune response in the American cockroach, Periplaneta americana: Reactivity to a more defined antigen, phospholipase A2. Dev. Comp. Immunol. 8:791-801.

1985.Rheins, L.A. and R.D. Karp. Effect of gender on the inducible humoral immune response to Honeybee venom in the American cockroach (Periplaneta americana). Dev. Comp. Immunol. 9:41-49.

1985. Rheins, L.A. and R.D. Karp. Ontogeny of the invertebrate humoral immune response: Studies on various developmental stages of the American cockroach. Dev. Comp. Immunol. 9:395-406.

1985. Karp, R.D. Preliminary characterization of the inducible humoral factor in the American cockroach (Periplaneta americana). Dev. Comp. Immunol. 9:569-575.

1986. George, J.F. and R.D. Karp. Recent progress in studies on cell-mediated immune responsiveness in insects. Exptl. Clin. Immunogenetics 3:1-9

1987. George, J.F., T.K. Howcroft and R.D. Karp. Primary integumentary allograft reactivity in the American cockroach, Periplaneta americana. Transplantation 43:514-519.

1987. Howcroft, T.K. and R.D. Karp. Demonstration of cell-mediated cytotoxicity to allogeneic and xenogeneic tissue in the American cockroach, Periplaneta americana, using a combination in vivo/in vitro assay. Transplantation. 44:129-135.

1987. George, J.F., R.D. Karp, B.L. Rellahan and J.L. Lessard. Alteration of the protein composition in the hemolymph of American cockroaches immunized with soluble proteins. Immunology 62:505-509.

1989. Eppensteiner, J. and R.D. Karp. The effect of gamma irradiation on the xenograft response in the American cockroach. J. Ins. Physiol. 35:81-86.

1989. Hartman, R.S. and R.D. Karp. Short-term immunologic memory in the allograft response of the American cockroach. Transplantation, 47:920-922.

1990. Karp, R.D. and L.E. Duwel-Eby. Adaptive immune responses in insects. In:"Phylogenesis of Immune Functions". (G. Warr and N. Cohen, eds.). CRC Press, Boca Raton, FL. pp. 1-18.

1990. Duwel-Eby, L.E. and R.D. Karp. The inducible humoral immune response to soluble proteins in the American cockroach. In: Defense Molecules. (J.J. Marchalonis and C.A. Reinisch, eds.)Alan R. Liss, New York. pp. 63-78.

1990. Karp, R.D. Cell-mediated immunity in invertebrates. BioScience 40:732-737.

1990. Karp, R.D. Transplantation immunity in insects - Does allograft responsiveness exist? Res Immunol. 9:923-926.

1990. Karp, R.D. Inducible humoral immunity in insects - Does an antibody-like response exist in invertebrates? Res. Immunol. 9:932-934.

1991. Duwel-Eby, L.E., L.M. Faulhaber and R.D. Karp. The inducible humoral response in the cockroach. In: Immunology of Insects and Other Arthropods. (A.P. Gupta, ed). Academic Press, New York. pp. 385-402.

1992. Faulhaber, L.M. and R.D. Karp. A diphasic immune response against bacteria in the American cockroach. Immunology 75:378-381.

1993. Karp, R.D. The response to foreign tissue transplants in insects. In: Parasites and Pathogens of Insects. Volume I: Parasites. (N.A. Beckage, S.N. Thompson and B.A. Federici, eds.). Academic Press, New York. pp. 305-316.

1993. Ryan, N.A. and R.D. Karp. Stimulation of hemocyte proliferation in the American cockroach (Periplaneta americana) by the injection of Enterobacter cloacae. J. Insect Physiol.39:601-608.

1993. Karp, R.D. and C. C. Meade. Transplantation immunity in the American cockroach, Periplaneta americana: The rejection of integumentary grafts from Blatta orientalis. Dev. Comp. Immunol. 17:301-307.

1994. Karp, R.D., L.E. Duwel, L.M. Faulhaber and M.A. Harju. Evolution of adaptive immunity: Inducible responses in the American cockroach. In: Primordial Immunity: Foundations of the Vertebrate Immune System. (G. Beck, G.S. Habicht, J.J. Marchalonis and E.L. Cooper, eds.). N.Y. Acad. Sci., NY. pp. 82-91.

1996. Karp, R.D. Inducible humoral immune defense responses in insects. In: Invertebrate Immunity, Progress in Molecular and Subcellular Biology, Vol. 15. (W.E.G. Muller and B. Rinkevich, eds.). Springer-Verlag, Berlin. pp 67-87.

1998. Karp, R.D. and M.L. DeLay. Transplantation of integumentary grafts in the American cockroach. In: Techniques in Insect Immnunology (A. Wiesner, ed.). SOS Publications, Fair Haven, NJ. pp 41-46.

1998. R. D. Karp, K.L. Cablish and L.M. Faulhaber. Laboratory culture of the American cockroach, and its use as a model for studying antimicrobial immunity in insects. In: Techniques in Insect Immunology (A. Wiesner, ed.). SOS Publications, Fair Haven, NJ. pp.125-133.

1998. Duwel, L.E. and R.D. Karp. The inducible humoral factor in the American cockroach: Demonstration of antigen binding activity by immune hemolymph proteins. J. Ins. Physiol. Submitted.

1998. Duwel, L.E. and R.D. Karp. The inducible humoral factor in the American cockroach: Identification and partial purification of the immune hemolymph proteins mediating binding activity. J. Ins. Physiol. Submitted.