Such a difficulty points to the importance of animal models, such as SIV-infected rhesus macaque, to discern the role for the thymus and secondary lymphoid tissues in evolution of X4 variants.
Overextensions are more common in speech than in comprehension, however; the child who uses the word "apple" for all round objects has no difficulty pointing to an apple in a picture illustrating several round objects.
On pommel horse and floor, it's easier to keep his momentum going, and he can perform leg flares, a high-value move that adds difficulty points to his start values.
And this difficulty points to the close relationship between Kant's moral philosophy and Christian theology.
Population projections are fraught with difficulty, points out Andrew Hinde of Southampton University.
"The more acrobatics you do, the more difficulty points you get.
If Hong lands the triple, the extra difficulty points could be enough to put her on top.
These difficulties point to the need for a large ongoing prospective study capturing key demographic and diagnostic data and outcomes, an approach likely to distinguish both temporal changes and the influence of drugs, like NSAIDs, that influence gastrointestinal bleeding.
Helping Mr Assad, directly or indirectly, would risk casting America as the agent of Iran and the Shias.All these difficulties point to the need for broad support.
These difficulties point to ambiguities in autonomy-based moral views, ones which may well be clarified in further developments of those theories.
These difficulties point to the potential usefulness of light treatment for depressed elders either to supplement or replace pharmacotherapy.
