Nanog, however, we report as not at all upregulated in the fish cells, and we cite papers that show that Nanog is also not necessary or even regulated at high levels in normal fish stem cells.
The Gaudí kit confirmed the existence of post-embryonic, bona fide stem cells in a variety of organs throughout the entire fish (previous sections, and data not shown) and therefore constitutes a fundamental and versatile tool for the study of fish stem cells.
The abundance of some predatory fishes stems from the fact that they are not targeted by the commercial fishery.
Interest in the evolutionary effects of fishing stem from the observation that age and size at maturation have been decreasing in several heavily exploited fish stocks – an expected adaptive response to increased pre-adult and adult mortality (e.g. Heino and Godø 2002; Law 2000).
There are still not enough farmed fish to stem this price rise.
The differences between the fish likely stem from what they use their luminescence for, Claes suggests.
Four female G. affinis had puncture wounds on their caudal peduncle (one per fish), presumably stemming from attacks by heteropterans or other predatory aquatic arthropods.
"Those fish sperm stem cells may be able to become other types of cells in addition to germ cells," he says.
Similar to the mouse retinal Lgr5+ cells reported here, the second group of fish retinal stem cells express Pax6 and proliferate slowly as they can only be detected by long-term BrdU or H-thymidine administration (Otteson et al., 2001).
According to ATCC (http://www.atcc.org/) which is one of the largest biosources in the world and offers investigators a complex array of human, animal, insect, fish, and stem cell lines, these three cell lines are not from primary breast cancer but are metastatic breast cancer cell lines derived from pleural effusion.
