To be able to write your own cover letter, read the generic letter of recommendation samples given below. The letter of recommendation is used in many fields, especially in the field of education.
This supports the idea that in embryos from wild-type mothers, dpp H~- mutations cause the transformation of dorsal into ven-tral epidermis. If tissue determined to become dorsal epidermis dies in the dpp rim-null embryos, then one should not see ventral or lateral tissue formed in the double-mutant combination.
The trp operon would be expressed at maximum levels in the absence of tryptophan, since the trp repressor would be unbound and the mutant leader region would allow full expression. b) A lacI-lacZ fusion gene has been identified that produces a chimeric protein with both repressor and Ã-gal function.