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However, in some cases, the cells formed clumps of cancerous tissue called teratomas, a major safety concern with stem cell therapies.

Twenty miles wide, the flood was almost dreamlike, the speeding water, as it streamed through the upper branches of trees, carrying along bits of brightly colored plastic and clumps of grass.

The cactus removed 98 per cent of bacteria within 15 minutes by clumping sediment and bacteria into small 'flocs' - clumps of particles floating in water - that could easily be filtered out.

Dig out the clumps of roots and divide them into smaller portions to replant.

Massive clumps of matter can act as a giant cosmic magnifying glass, distorting space-time in their immediate vicinity.

Slowly, a vast "cosmic web" of filaments and clumps of dark matter formed, and within them, the galaxies.

We followed a sandy track with dazzling views through clumps of juniper and wild olive to the blue-green sea far below.

The eggs lie hidden in hollow trees, clumps of grass, and in many kinds of nests.

It was collectively, in its clumps of khaki, navy and air force blue, that the congregation had its force.

In the yard were muddy clumps of grass, lots of hidden pieces of broken glass and roofing tiles that had slid to the ground and were just left there.

The clumps of blossoms had just been bathed; every sort of velvet, satin, gold and varnish, which springs from the earth in the form of flowers, was irreproachable.

The ground was brown with clumps of yellowing grass and grey gravel.