Chromosomal Proteins, Non-Histone; DNA Helicases; DNA-Binding Proteins; Diptera/genetics; Dosage Compensation, Genetic; Drosophila Proteins; Drosophila melanogaster/genetics; Genes, Insect; Insect Proteins/genetics; RNA Helicases/genetics; Transcription Factors/genetics; Amino Acid Sequence; Animals; Antibodies, Monoclonal/immunology; Cell Nucleus/ultrastructure; Chromosomes/chemistry; Cloning, Molecular; Diptera/embryology; Drosophila melanogaster/embryology; Embryo, Nonmammalian/metabolism; Embryo, Nonmammalian/ultrastructure; Female; Fluorescent Antibody Technique, Indirect; Gene Expression Regulation, Developmental; Insect Proteins/immunology; Insect Proteins/physiology; Male; Molecular Sequence Data; RNA Helicases/immunology; RNA Helicases/physiology; Sequence Alignment; Sequence Homology, Amino Acid; Sex Determination Processes; Species Specificity; Transcription Factors/immunology; Transcription Factors/physiology; Transcription, Genetic; X Chromosome/genetics