Segmentation protein paired; Paired (prd) is a paired-rule gene that encodes a transcription factor with two independent DNA binding domains, a paired domain and a homeodomain. Its roles include embryonic segmentation, accessory gland development and male fertility.

Homeobox protein abdominal-A; Sequence-specific transcription factor which is part of a developmental regulatory system that provides cells with specific positional identities on the anterior-posterior axis. Required for segmental identity of the second through eighth abdominal segments. Once a pattern of abd-A expression is turned on in a given parasegment, it remains on the more posterior parasegment, so that the complex pattern of expression is built up in the successive parasegments. Appears to repress expression of Ubx whenever they appear in the same cell, but abd-A is repressed [...]

Sloppy paired 1 (slp1) encodes a transcription factor of the fork-head family that functions by interacting with the corepressor encoded by gro. The product of slp1 regulates a wide variety of developmental processes including embryonic segmentation, ventral fate specification in the retina, and temporal patterning of the neuroblasts that produce medulla neurons.

Protein hunchback; Gap class segmentation protein that controls development of head structures; Belongs to the hunchback C2H2-type zinc-finger protein family.

Huckebein (hkb) is expressed in patches within the embryonic neuroectoderm and a subset of neuroblasts and their progeny, where it is required for proper neuronal specification and axon targeting. It is a terminal gap gene mediating the maternal terminal information at the posterior end of the blastoderm embryo.

Protein odd-skipped; Pair-rule protein that determines both the size and polarity of even-numbered as well as odd-numbered parasegments during embryogenesis. DNA-binding transcription factor that acts primarily as a transcriptional repressor but can also function as a transcriptional activator, depending on the stage of development and spatial restrictions. May function redundantly with odd and drm in leg joint formation during the larval stages, acting downstream of Notch activation.

Zygotic gap protein knirps; Transcriptional repressor. Binds to multiple sites in the eve stripe 3 enhancer element. Plays an essential role in the segmentation process both by refining the expression patterns of gap genes and by establishing pair-rules stripes of gene expression.

Protein bowel; Putative transcription factor. Required for leg joint formation, acting downstream of Notch to pattern the leg tarsal segments. Functions in the terminal pathway during embryogenesis, acting downstream of tll in the posterior of the embryo. Acts in a hierarchy downstream of drm and lin during foregut and hindgut patterning and morphogenesis. Involved in cell rearrangement during elongation of the embryonic hindgut. Regulates expression of hindgut patterning genes to establish the small intestine region of the embryonic hindgut. Required in the foregut for spatially local [...]

Protein sister of odd and bowel; Pair-rule protein that determines both the size and polarity of even-numbered as well as odd-numbered parasegments during embryogenesis. DNA-binding transcription factor that acts primarily as a transcriptional repressor but can also function as a transcriptional activator, depending on the stage of development and spatial restrictions (By similarity). May function redundantly with odd and drm in leg joint formation during the larval stages, acting downstream of Notch activation.