There are more than ten subtypes of CyPs in mammals, distributed in different subcellular compartments, that function in numerous cellular processes, including transcriptional regulation, immune response, protein secretion, and mitochondrial function [7] [9].
There are two subtypes of OTUB in mammals, OTUB1 and OTUB2, which have relative molecular masses of 31 kDa and 27 kDa respectively.
To assess whether this mechanism of stratification is also applicable to some subtypes of the RGCs in mammals, molecular markers are required for distinguishing among the different types of RGCs.
The former might reflect the complexity of PRC1 subtypes in mammals and the fact that SCML2 is also part of PRC1.2, which does not contain BMI1 (Gao et al., 2012); the latter is likely due to the higher sensitivity of the BMI1 antibody, although we cannot exclude that some BMI1 target sites are devoid of SCML2.
In marine mammals, several subtypes of avian influenza A virus have caused epidemics in harbor seals (Phoca vitulina) (3 – 6 ).
The trace amine-associated receptor family is a distinct subfamily within the family of rhodopsin-like G protein-coupled receptors (GPCR) and consists of 9 TAAR subtypes in mammals.
In the central nervous system the cholinergic transmission is mainly mediated by muscarinic receptors; there are five subtypes that are all expressed in the brain of mammals (m1 m5).
The cloning era of G-protein-coupled receptors led to the discovery of five somatostatin receptor subtypes in mammals, named SSTR1 through 5[ 21].
For the nine species of mammals, we classified the introns into three subtypes according to their terminal dinucleotide sequences.
We two interesting examples of recombinant histories in the potential Athila retroviruses of plants [ 9] and the HIV-like Retroviridae retroviruses [ 10] of mammals, whereby new forms emerge from the recombination of subtypes.
