Protein constituents of the eggshell: eggshell-specific matrix proteins

In this article, we review the results of recent proteomic and genomic analyses of eggshell matrix proteins and draw attention to the impact of these data on current understanding of eggshell formation and function. Eggshell-specific matrix proteins from avian (ovocleidins and ovocalyxins) and non-avian (paleovaterin) shells are discussed. Two possible roles for eggshell-specific matrix proteins have been proposed; both reflect the protective function of the eggshell in avian reproduction: regulation of eggshell mineralization and antimicrobial defense. An emerging concept is the dual role (mineralization/antimicrobial protection) that certain eggshell matrix proteins can play.     

A simple system of multiple organ-baths

Summary A compact and easily assembled system of multiple organ-baths is described, in which use is made of readily available materials.Acknowledgment. G.E.R. was in receipt of the ruggles Gates Research Award.     

Immunity to coccidiosis: Gut permeability changes in response to sporozoite invasion

Zusammenfassung Mit einer neuen Methode wird gezeigt, dass die Invasion des Darmepithels von immunen Hühnern durch Sporozoiten verschiedenerEimeria-Arten zu einer vermehrten Durchlässigkeit der Gefässe führt.     

Epidermal growth factor enhancement of skin tumor induction in mice

Summary Subcutaneous injection of epidermal growth factor 1. significantly shortened the latency period for the appearance of methylcholanthrene induced skin tumors and 2. increased the average number of papillomas elicited per mouse in both the Swiss Webster and C3HeB/FeJ strains.Acknowledgments. This research was supported by USPHS NCI Grant No. CA 15276 and Contract No. GEN-12 between the Regents of the University of California and the U.S. Energy Research and Development Administration. We thankIlmar Lepik for his assistance in some phases of these experiments.