For example, p53 is a main checkpoint regulator in G1/S phase, while checkpoint kinase 1/2 (CHK1/22, CHK1/2) is crucial in S and G2/M checkpoints.
Around 600 demonstrators marched on Qalandia, the main checkpoint between the West Bank and Jerusalem.
"Winter at Qalandia" is set at the main checkpoint outside Jerusalem.
"At 4am we heard an explosion; Isis had exploded a bomb at the main checkpoint.
When Vice News visited the main checkpoint outside Artemivsk, 50 miles north of Donetsk, the midday sun was stifling and families had been stuck in line for hours.
Beyond the main checkpoint lay the town, the stronghold of the 72nd mechanized brigade.
Thus, PBGD seems to be the main checkpoint in PpIX synthesis in our B16 melanoma system.
Three main checkpoints exist: G1/S, intra-S phase, and G2/M.
At 3pm on Tuesday, his father received a call asking him to report to the main Israeli checkpoint into Bethlehem for questioning.
There have been armed Palestinians at that checkpoint for years".
