But a new study shows that
zebrafish tails have their own organizing blueprint and are assembled independently of the head and body.
To investigate how
zebrafish tails take shape, Thisse's team removed some of the presumed pre-tail cells from early - stage embryos, then transplanted them into the middle of another embryo.
In another set of experiments, Thisse and his colleagues found that three molecules called BMP, Wnt8, and Nodal team up to create
zebrafish tails.
The effects of paclitaxel, a chemotherapy drug, can be seen on the cellular structures of the skin of a larval
zebrafish tail fin.
Not exact matches
An RNA cocktail injected into a
zebrafish embryo produces an abnormally placed second
tail.
The resulting
zebrafish grew an extra
tail — and only a
tail — that extended from its trunk.
Wherever they injected RNA for the trio into the
zebrafish embryos,
tails popped up, the team reports in the 24 July issue of Nature.
The results indicate that, obtained with a
tail - beat frequency of, is a critical speed for the robotic fish, with increases above or below this threshold differentially affecting
zebrafish collective response.
Specifically, in [12], it is shown that
zebrafish responds differentially to variation in aspect ratio and color in the robotic fish; in [13], it is demonstrated that
zebrafish shoals prefer such a robotic fish to an empty compartment; in [14], it is demonstrated that an interactive robot, whose
tail - beat frequency responds to fish position, is able to induce preference among single organisms; and in [17], it is shown that the robotic fish is able to simultaneously attract shoals of
zebrafish while repelling shoals of mosquitofish that would otherwise display aggressive behavior.
Want to see a
zebrafish regrow its
tail?
Voot Yin knew a
zebrafish could re-grow its severed
tail or sliced - off heart tissue, so why couldn't humans?
Specifically, in this series of works it is demonstrated that the behavioral response of
zebrafish individuals and small shoals varies as the aspect ratio, color pattern, and
tail - beat frequency of a robotic fish is changed.
Specifically, the following predictions are expected to be met: i) fish attraction toward the robotic fish should vary as the visual cues offered by the robotic fish are varied, in agreement with similar observations for
zebrafish in [35]--[37]; ii) fish attraction should vary as a function of the robotic fish
tail - beat frequency, as suggested in [60] and observed in [20]; and iii) the highest attraction should be reached when both visual and flow cues from the live fish are simultaneously integrated in the robotic fish prototype.
«If you amputate the
tail of the
zebrafish, it regenerates in about a week, seemingly with no effort and leaving no scar,» explains Stewart.
Reduction of one of the lincRNAs, which they called cyrano, caused the
zebrafish to have enlarged snouts, small heads and eyes, and short, curly
tails, while the
zebrafish lacking the lincRNA they called megamind had abnormally shaped heads and enlarged brain ventricles.
The Washington researchers have discovered some of the genes that allow
zebrafish to regrow their
tail fins, which could one day help humans regrow damaged body parts.
The
zebrafish can keep its stripes, and its
tail.
If the fish's fin gets bit off by, say, another hungry fish, the
zebrafish can grow a new
tail in about a week, according to University of Washington researchers.