The following questions refer to the figure below of a sagittal, T1-weighted MRI of the knee. 
-Which line is pointing to the vastus medialis muscle?
Definitions:
Epistasis
A genetic interaction where the effect of one gene is modified by one or several other genes, which can mask or alter its phenotype.
XIST
A gene involved in X chromosome inactivation, playing a crucial role in dosage compensation between males and females.
Long Noncoding RNA
A type of RNA longer than 200 nucleotides that does not code for protein but plays various roles in regulating gene expression at the transcriptional and post-transcriptional levels.
X Chromosomes
One of the two sex chromosomes in mammals, including humans, responsible for determining genetic sex when paired with a Y chromosome for males or another X chromosome for females.
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