The phrase "assumed extensive" is correct and usable in written English.
It can be used when discussing something that is believed to be large in scope or degree, often without direct evidence.
Example: "The research was based on the assumed extensive knowledge of the subject matter by the participants."
Alternatives: "presumed significant" or "believed to be extensive."
There have been, in effect, two military plans by the United States: one that assumes extensive Turkish cooperation in a military campaign to dislodge Saddam Hussein's government and one that does not.
Assuming extensive synteny and gene order conservation, such an approach makes it possible to build large scaffolds even with low coverage data (Kim et al. 2013) or using very short sequence reads (Wang et al. 2014).
[Author's response: Assuming extensive gene loss during emergence of certain lineages is indeed emphasized in our presentation; if the old idea of emergence of Bacteria and Archaea by "streamlining" of a more sophisticated ancestor is correct, it must have involved extensive gene loss indeed.
It is usually assumed that extensive loss of CD4+ T cells in the acute phase of HIV infection prevents the establishment of robust T cell help required for virus control in the chronic phase.
We assumed that extensive analysis of gene expression might guide towards the function of P450 enzymes, and highlight overlooked aspects of plant metabolism.
Several of the respondents were treated with Warfarin and it can be assumed that extensive information was given when the therapy was initiated, since this is done according to regulation in Sweden.
Of course the depicted controls in the white and brown goods as well as miscellaneous area assume an extensive integration into a home automation network.
The compact design assumes an extensive development and utilization of public transport, made viable through high density development implying a more efficient transport system.
The multifactorial sub-challenge, posted in the DREAM4 initiative web page [5] aimed to reverse engineer five gene regulatory networks of size 100 with an experimental scenario assuming that extensive knockout/knockdown or time series experiments, could not be performed.
