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 Dfd gene is responsible for the formation of the maxillary and mandibular segments in the larval head. The mutant phenotypes of Dfd' are similar to those of labial. Loss of function of Dfd in the embryo results in a failure of head involution (see labial gene), with a loss of larval head structures.