Upon embedding multicellular tumor spheroids, we constructed a 3D tumor invasion model showing follow-the-leader migration with fibroblasts leading invasion of cancer cells similar to in vivo.
'Follow the leader' chain migration, in which cells maintain relatively stable relations with the same neighbors, 'run and tumble', in which directional migration is followed by random and unpredictable cell movement, 'mutual co-attraction' and 'contact inhibition' are all examples of migratory behaviors that have been described for NC cells.
In both species, the cells move as a collective from one location to another; in chick embryos, there is a "follow the leader" chain migration in which the spatial order of cells is retained [ 3- 7].
A summit of EU leaders on migration is being held on Wednesday in Brussels at the behest of Angela Merkel, the German chancellor.
Tusk and Juncker are seeking reassurance on key issues on which Trump's remarks on the campaign trial have rattled European leaders, including migration, climate change and Russia's threat to Ukraine.
The body was being treated in accordance with the Orthodox tradition, Ahmet Davutoğlu told a news conference in Ankara on Sunday before going to Brussels for a meeting with EU leaders on migration.
European leaders debating migration in Brussels today must put human lives before short-term political goals, politicians and humanitarian groups have urged, cautioning against simply reinforcing borders and freezing out the world's most needy refugees.
Mr Tusk was speaking in Malta after a summit of EU leaders on migration, from which Mr Cameron was absent after returning to London to welcome the Indian Prime Minister Narendra Modi.
While David Cameron's campaign to refashion the terms of Britain's EU membership was set to occupy much of a critical summit, for many of the other leaders the migration crisis loomed larger, given that an estimated 1.2 million people have entered the European Union this year, mainly from the Middle East.
A statement from Varadkar's office said the two leaders discussed "migration, Brexit and the movement of goods and citizens across the border, climate change, free trade, Irish inward investment in the US, and the undocumented Irish," according to The Irish Times. .
