DNA is the substance of our genes.
he is a man of means.
shigella is one of the most toxic substances known to man.
the gist of the prosecutor's argument.
the heart and soul of the Republican Party.
the immune response recognizes invading substances.
the nub of the story.
What is the meaning of this proverb?.
when the dough has enough consistency it is ready to bake.
wool has more body than rayon.