Regeneration within the cns regeneration within the cns typically allows axonal sprouting of 20 mm is prevented due to growth-inhibiting proteins of oligodendrocytes is more successful than with the pns is promoted by growth inhibitors and glial scars

Regeneration describes the regrowth of cells and tissues of the body. CNS regeneration is also referred to as neuroregeneration. 
Regeneration within the Central Nervous System (CNS) is prevented due to growth-inhibiting proteins of oligodendrocytes. 

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

Size and shape of continents