Abstract
Investigation of the chemical composition of the blastocyst fluid of rabbits was undertaken to elucidate some of the less known problems of the pre- and implantation periods. The blastocyst fluid was determined by combined paper-column chromatography. Seventeen amino acids were found in the period between the fifth and seventh days after mating. The levels of amino acids were high and relatively constant during this period. Between the seventh and eighth days after mating a considerable drop in the concentration of the majority of the amino acids was noted. This drop appears to be related to the growing concentration of proteins which accompany the implantation and post implantation development of the egg cells.
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