The phrase "presumably responsible for" is grammatically correct and can be used in written English.
It is typically used to indicate that someone is believed to be responsible for something, but there is not enough evidence to be certain. Example: The senator was presumably responsible for leaking confidential information, but until we have concrete evidence, we cannot accuse them outright.
Modifications within these convergent windows of positive selection are presumably responsible for driving enzyme properties towards local optima in response to a host of species-specific adaptations.
The researchers, from Aarhus University in Denmark, said the caffeine in coffee was presumably responsible for the increased risk.
The selected versions of the genes occur solely in Europeans and are presumably responsible for pale skin.
The high Zn to Cd ratio is presumably responsible for the Cd increase in the soil extracts due to competitive displacement by Zn.
A single nucleotide polymorphism (SNP), rs10774671, presumably responsible for alternate splicing of this gene, has frequently been associated with a variety of viral diseases, including emerging respiratory infections.
Jones was also presumably responsible for the prop plane flying endless circles overhead, trailing a banner that read, "Hillary for Prison".
Stephen Dubner, Mr Levitt's co-author, is a contributor to the New York Times magazine, and presumably responsible for the book's frequently tiresome breathlessness.
Anything further would require the kind of fairy-godmother-style intervention presumably responsible for Japan's ridiculous ($249m) box-office contribution to Frozen – which pushed it, like Alice in Wonderland, into the realm of the $1bn mega-hit.
Ti2p binding energy peaks indicate that the formation of Si O Ti linkage is presumably the responsible for the high rigidity of the matrices.
Climatic change presumably is responsible for the presence of duricrusts in equatorial areas that now receive more than 1,200 mm mean annual precipitation.
In 1993, he backed the intelligence services bill to provide such a supervisory body, recounting his own clashes with MI5 and M16, which had blocked his passport at one stage and, presumably, been responsible for bugging his telephone and burgling his flat.
