The phrase "an endogenous origin of" is correct and usable in written English.
It can be used in contexts discussing the source or cause of something that arises from within a system or organism.
Example: "The researchers found evidence supporting an endogenous origin of the disease, suggesting that it developed from internal factors rather than external influences."
Alternatives: "a native source of" or "an internal origin of".
Whereas stable isotope signatures of feathers reflect an exogenous origin, i.e. they are promptly transferred from the diet to feathers when moulting [29], elemental burdens of feathers may indicate an endogenous origin of elements, i.e. they are partially mobilized from various organs where they are stored [30], [31].
Consequently, an endogenous origin of these compounds can be assumed.
Instead, the data indicate an endogenous origin of peroxisomes from the endoplasmic reticulum.
All of these were reported as negative as IRMS results clearly showed an endogenous origin of T and/or its precursors.
22 GC-C-IRMS confirmation analysis was performed following the method published by Piper et al 30 and the results indicated an endogenous origin of formestane leading to a negative reporting of the sample.
These conditions make it difficult to grow vegetation that would have a consequent contribution to the organic matter of an endogenous origin, which is important for post-mining land reclamation processes.
But still cases of ICU-acquired ESBL-E fecal carriage occurred suggesting an endogenous origin in a non-outbreak situation.
John M. Logsdon, Jr., Department of Biological Sciences, Roy J. Carver Center for Comparative Genomics, University of Iowa, Iowa City, IA 52242 USA Comments: This paper reports the "phylogenomic" analysis of peroxisomal proteins with an aim to distinguish between an endosymbiotic vs. endogenous origin of this organelle in eukaryotic cells.
These observations support an alternative hypothesis of endogenous origin of peroxisomes.
that the cellular surveillance systems have played a crucial role in the endogenous origin of introns throughout the eukaryotes.
This hypothesis however does not explain the specific elimination of the isoprenoid membrane from the engulfed Archaeon; it is also at variance with the well-documented model presented by Devos et al [ 61] to explain the endogenous origin of the nucleus.
