We present some properties of
clones whose members are induced by polynomials in
$D[\bar{x}]$ over some integral domain $D$. We use these
polynomials to derive properties of finite nilpotent algebras in
congruence modular varieties.
This is joint research with S.\ Kreinecker (JKU Linz) supported
by the Austrian Science Fund (FWF):P29931.