When the indexes of fragmented DNA in the nuclei
of blastocysts derived from embryos exposed to 100
M H2O2 during individual culture were examined, the
DNA fragmentation index of total blastocysts that developed
from embryos cultured with 0.5% sericin was
lower (P 0.01) than that of total blastocysts from
embryos cultured without sericin (4.4 vs. 6.8%; Fig. 1).