The jawless vertebrates, represented by hagfish and lampreys, are the most advanced animals that apparently lack T cell and B cell receptors. As such, they offer unique opportunities for understanding the evolution of antigen receptors and variable (V)-type immunoglobulin (Ig)-like domains. In ...
There are only two extant jawless vertebrate groups: hagfish and lampreys. In lampreys, even though the nasal placode is a single midline structure, the development of the hypophyseal region is similar, and probably homologous to that in gnathostomes, except for dorsal shifting of the distal...
The sea lamprey, a jawless fish, can provide unique insights into vertebrate origins owing to its phylogenetic position at the base of the vertebrate tree1,2,3. It has been suggested that lamprey may represent an intermediate state where nested Hox expression has not been coupled to the ...
The first fish were primitive jawless forms (agnathans) which appeared in the Early Cambrian, but remained generally rare until the Silurian and Devonian when they underwent a rapid evolution.Ray-finned fish (part1) : Ancient Actinopterygii
000 species of fish making them the most diverse group of vertebrates. Taxonomically fish are a paraphyletic group whose exact relationships are much debated; a mon division is into the jawless fish (class Agnatha 75 species including lampreys and hagfish)the cartilaginous fish (class...
The earliest vertebrates didn’t have jaws, but once true jaws evolved the animals that had them quickly became more numerous and diverse. These days, the only jawless fishes left are a few dozen species of lampreys and hagfishes, but in the Early Devonian most fishes lacked jaws. One of...
Lampreys and hagfish are primitive jawless vertebrates capable of mounting specific immune responses. Lampreys possess different types of lymphocytes, akin... Thomas,Boehm,Nathanael,... - 《Annual Review of Immunology》 被引量: 120发表: 2012年 Evolutionary and Functional Relationships of B Cells ...
Variable domains in hagfish: NICIR is a polymorphic multigene family expressed preferentially in leukocytes and is related to lamprey TCR-likeThe jawless vertebrates, represented by hagfish and lampreys, are the most advanced animals that apparently lack T cell and B cell receptors. As such, ...