Given an abstract, indicate which of the provided candidate titles (Option1 and Option2) best describes it (respond with the text of the title, not option1/2).
Q: Abstract: After fertilization, the protein products of the Drosophila homeobox gene caudal (cad) accumulate in a concentration gradient spanning the anteroposterior axis of the developing embryo. Mutations in the cad gene that reduce or eliminate the gradient cause abnormal zygotic expression of at least one segmentation gene (fushi tarazu) and alter the global body pattern.
Which is the apt title for the abstract? option1: A molecular gradient in early Drosophila embryos and its role in specifying the body pattern. option2: Increased MR signal intensity in skeletal muscle adjacent to malignant tumors: pathologic correlation and clinical relevance.
A:
A molecular gradient in early Drosophila embryos and its role in specifying the body pattern.