Ex Vivo vs. In Vivo Gene Therapy
Q: Gene therapy can be performed both ex vivo and in vivo.
Did You Know?
When a forger creates a document by **tracing** an authentic signature or handwriting, several telltale signs can be present, but the most indicative is **tremor and poor line quality in the traced writing**. Tracing is a slow, deliberate, and unnatural process. The forger must carefully follow the outline of a model signature, often while looking back and forth between the model and the new document. This results in a drawn appearance rather than the fluid, confident strokes of natural handwriting. The pen movements are hesitant, leading to a shaky line with visible tremors, pen lifts in unnatural places, pauses, and blunt starts and stops. The line may also show blunt endings where the forger carefully lifted the pen. In contrast, a freehand forgery attempt might show signs of hesitation and patching but may have a more natural rhythm. Other signs of tracing can include indentations or impressions of the writing on the underlying sheet (if carbon paper or pressure was used) or evidence of a 'guide' such as a faint pencil outline that was later inked over. A document examiner uses a microscope and oblique lighting to detect these subtle defects in line quality that are hallmarks of a traced forgery.
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