The cranial stripe could also be involved in boundary formation, either maintaining a preformed but morphologically invisible metameric pattern in the PSM, defining cranial-caudal compartments in the forming somite, or regulating the generation of intersomitic boundaries.
Thermal care includes maintaining a warm chain at and around the time of birth to prevent hypothermia, an invisible cause of morbidity and mortality, especially in premature and low birth weight babies [ 12, 32].
By the end they are invisible, capsized in the mud with the dinghy on top of them, somehow maintaining a heroic grip on their drinks.
But the past 12 years of semi-acknowledged collaboration were preceded by decades in which the CIA maintained a deep-rooted but invisible influence of Hollywood.
The pool, with its inner surface painted black, was filled to a depth of 40 cm with water (maintained at 25±1°C), covering an invisible (black) 10-cm square platform.
Platforms such as MTurk maintain workers invisible and not able to communicate with each other.
But that doesn't mean that editors wish to remain invisible; some use Twitter and other social media tools to build and maintain a public profile.
But Kawara maintained a public profile that was not only low — to the end of his life, he almost never consented to being interviewed or photographed — but invisible, apart from sporadic appearances at group shows.
(The trick is an invisible separation, toilsome to maintain, between distilled water above and salt water below).
