Streptothricin. I. Preparation, Properties and Hydrolysis Products1

.?M

C IRTCR, CLIRK,T < o r m , ROTITROCK, T.IYI,OR,EST, LYHITFIELD A N D JACKSON

not possible to establish any immunological differences between the two dextran fractions I and 9 which differed ill molecular weight. Despite these limitations, however, and in view of the high purity of the C14-dextran usedJ2 the data clearly establish that the precipitin produced by human heings in response to the injection of small

Vol. '76

amounts of dextran is indeed antibody to dextran. The authors wish to acknowledge the valuable assistance of ~~~~~hE. ~ ~ ~~ 1 1 , ~J. >farano~ and Kenneth -;2mirian of the ~ l ~ Institute. YEW YORK,

S.Y .

Streptothricin. I. Preparation, Properties and Hydrolysis Products1 BY H. E . C I R r m , I