Abstract: A modular power unit (2; 200) for use with a power tool (1; 101; 102; 103) is provided. The modular power unit comprises a housing (3, 5, 7; 201); a motor (24); and a controller (23) arranged to control an operation of the motor (24), wherein the motor and the controller are at least partially enclosed by the housing. A power tool comprising the modular power unit is also provided.

Abstract: The current invention provides methods for determining the estrogenic activity of a compound, which includes contacting an estrogen-responsive system having a gene under the control of a DMBT1 regulatory sequence with a test compound and determining how the test compound affects expression of the gene. The invention further provides for determining the progestogenic activity of a compound, which includes contacting an estrogen- and progesterone-responsive system having a gene under the control of a DMBT1 regulatory sequence with an estrogenic activity and a test compound and determining how the test compound effects expression of the gene. Nucleic acids and cell-based systems that include a portion of the DMBT1 regulatory sequence useful for these methods are also provided.