AN odd-looking horse on wheels is unusual because its origins are well established.
The Sheep Track Pumice is mysterious because the vent of its origin is unknown, even though it is estimated from its state of preservation to be younger than 500 years old.
However one line annotated as having an African origin (ZW184) does not group with the other Zimbabwe lines; we have excluded this line from subsequent population genetic analyses because its Zimbabwe origin is suspect, although it remains included in the global set of lines for modeling and mapping applications.
The presence of methane is intriguing because its likely origin is either present-day life or geological activity.
Its origins are mysterious, because there is hardly any moisture to speak of.
The mild decline after 37.5%, which was observed in DFT, is not reproduced because its origin (see above) is not included in the electrostatic model.
That shower was the Leonids, so named because its radiant (or origin) is in the constellation Leo.
Memorial Day dates back to the 19th century but its exact origin isn't known because at least 25 locations claim to be the holiday's birthplace.
However, LMS arising in the intima has poorer prognosis than mural sarcomas because intimal origin is a source of widespread metastases.
Modeling ovarian cancer however is challenging as a result of the genetic heterogeneity of the malignancy, the diverse pathology, the limited availability of human tissue for research, the atypical mechanisms of metastasis, and because the origin is unclear.
