If you suffer from certain genetic illnesses, or carry a gene for that illness, scientists can take one or two cells to check for those genes and transfer only healthy embryos.
Scientists are able to only insert healthy embryos by checking for genetic illnesses beforehand.
( z1 possible :ARG1 ( z2 insert :ARG0 ( z3 scientist ) :ARG1 ( z4 embryo :mod ( z5 healthy ) ) :mod ( z6 only ) :manner ( z7 check :ARG0 z3 :ARG1 ( z8 ill :mod ( z9 genetics ) ) :time ( z10 beforehand ) ) ) )