MICROANATOMY

Detailed explanation-1: -Cyclins. Cyclins are among the most important core cell cycle regulators. Cyclins are a group of related proteins, and there are four basic types found in humans and most other eukaryotes: G 1start subscript, 1, end subscript cyclins, G 1start subscript, 1, end subscript/S cyclins, S cyclins, and M cyclins.

Detailed explanation-2: -Two groups of proteins, cyclins and cyclin-dependent kinases (Cdks), are responsible for promoting the cell cycle.

Detailed explanation-3: -Positive Regulation of the Cell Cycle Two groups of proteins, called cyclins and cyclin-dependent kinases (Cdks), are responsible for the progress of the cell through the various checkpoints. The levels of the four cyclin proteins fluctuate throughout the cell cycle in a predictable pattern (Figure 2).