Ticket #5904 (new)

Opened 7 days ago

Type 2 Diabetes “Off Switch” Found Inside Certain Brain Cells

Reported by: "Mellitox" <Mellitox@…> Owned by:
Priority: normal Milestone: 2.11
Component: none Version: 3.8.0
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Type 2 Diabetes “Off Switch” Found Inside Certain Brain Cells



ever, withdrawing immediately if contact occurs. When approached by foreign potential predators (e.g. a submersible), they show panic flight reactions, suggesting that coelacanths are most likely prey to large deepwater predators. Shark bite marks have been seen on coelacanths; sharks are common in areas inhabited by coelacanths. Electrophoresis testing of 14 coelacanth enzymes shows little genetic diversity between coelacanth populations. Among the fish that have been caught were about equal numbers of males and females. Population estimates range from 210 individuals per population to 500 per population. Because coelacanths have individual color markings, scientists think that they recognize other coelacanths via electric communication.
elacanth eggs are large, with only a thin layer of membrane to protect them. Embryos hatch within the female and eventually are born alive, which is a rarity in fish. This was only discovered when the American Museum of Natural History dissected its first coelacanth specimen in 1975 and found it pregnant with five embryos. Young coelacanths resemble the adult, the main differences being an external yolk sac, larger eyes relative to body size and a more pronou
Coelacanths are nocturnal piscivores that feed mainly on benthic fish populations and various cephalopods. They are "passive drift feeders", slowly drifting along currents with only minimal self-propulsion, eating whatever prey they encounter.

Life history

Latimeria chalumnae embryo with its yolk sac from the Muséum national d'histoire naturelle

Latimeria chalumnae egg
Coelacanths are ovoviviparous, meaning that the female retains the fertilized eggs within her body while the embryos develop during a gestation period of five years. Typically, females are larger than the males; their scales and the skin folds around the cloaca differ. The male coelacanth has no distinct copulatory organs, just a cloaca, which has a urogenital papilla surrounded by erectile caruncles. It is hypothesized that the cloaca everts to serve as a copu

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