Muscle action during swimming and the contractile properties of isolated muscle fibres were studied in the short-horned sculpin Myoxocephalus scorpius at 5 ̊C. Semi-steady swimming, startle responses and prey-capture events were filmed with a high-speed video at 200frames s21, using fish 22–26cm in total length (L). Electromyographical (EMG) recordings, synchronised with the video, were made fro...

In tetrapod phylogeny, the dramatic modifications of the trunk have received less attention than the more obvious evolution of limbs. In somites, several waves of muscle precursors are induced by signals from nearby tissues. In both amniotes and fish, the earliest myogenesis requires secreted signals from the ventral midline carried by Hedgehog (Hh) proteins. To determine if this similarity rep...

Levels of 18 elements, including lead, mercury, selenium, and uranium, were examined in three species of snakes from an exposed and reference site on the Department of Energy's Savannah River Site in South Carolina. We tested the hypotheses that there were no differences as a function of species, and there were no difference between the exposed and control site for blood and muscle (tail) sampl...

Previous studies have identified a minimal 434 bp enhancer from the promoter region of the Ciona Brachyury gene (Ci-Bra), which is sufficient to direct a notochord-specific pattern of gene expression. Here we present evidence that a Ciona homolog of snail (Ci-sna) encodes a repressor of the Ci-Bra enhancer in the tail muscles. DNA-binding assays identified four Ci-Sna-binding sites in the Ci-Br...

Integrin signaling impacts many developmental processes. The complexity of these signals increases when multiple, unique integrin heterodimers are expressed during a single developmental event. Since integrin heterodimers have different signaling capabilities, the signals originating at each integrin type must be separated in the cell. C. elegans have two integrin heterodimers, α INA-1/β PAT-3 ...

Kocaoğlu C, Kocaoğlu Ç, Akkoyun İ, Karaniş İE. A case report with sacral appendage: Is it accessory penis or human tail? Turk J Pediatr 2017; 59: 335-337. Lumbo-sacro-coccygeal appendages are very rare congenital anomalies. It is difficult to say that they are a evolutionary inheritance (tail) from our ancestors or an anomaly (pseudotail) occuring during embrional development. If it is a true t...