Word: clustered
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...Cover) Along the banks of the meandering Brandywine River, set on a bluff that overlooks nearby Wilmington, stands a cluster of buildings whose occupants are true men of mystery. Many of them work in perpetual semidarkness and others in rooms that seem as barren as the face of Mars. Some spend their days poring over books and others sit for hours staring through picture windows at the 115 acres of their campus-like enclave. The aura of the place is one of uncertainty, as if no one quite knows what will happen next. No one does know. That is what...
...stiff lava forced out of parallel cracks in the moon's crust. Some of them may have erupted during the moon's youth. Much more recently - 100 million years ago or less - one of the cracks may have opened agan and oozed laval to form a cluster of low black mounds on a plain that was already thickly peppered with debris from young Tycho...
...conspicuous is the Golden Gateway project at the foot of Telegraph Hill. On the site of the fragrant old Central Market, which was moved, like Philadelphia's, to more efficient, truck-oriented quarters far from the center of town, three high-rise apartment houses have gone up with a cluster of little blue-roofed town houses in between. Both the houses and the apartment buildings rise from a platform two stories high; the covered area underneath will be used for parking, and will also serve as a pedestrian galleria of shops. San Francisco also has its own conservation program...
From the very beginning, Harvard had a cluster of runners at the front of the pack, leaving little doubt about the team outcome...
Cholesterol is a steroid, one of a huge and diverse class of chemicals-including many fatty substances and most adrenal and sex hormones-having one thing in common: a four-ring cluster of carbon atoms, known as "the steroid nucleus." Other attached atoms give each steroid its distinctive character (see diagram). By growing rat-liver cells in the test tube, Dr. Bloch learned that they make cholesterol from the much simpler acetate ion (acetic acid minus a hydrogen ion). "My work since then," he says, "has been on the processes that the cell uses to manufacture the cholesterol molecule. This...