Question: what kind of transport mechanisms are used for reabsorption

title: Reuptake
text: The first primary sequence of a reuptake protein was published in 1990 . The technique for protein sequence determination relied upon the purification , sequencing , and cloning of the transporter protein in question , or expression cloning strategies in which transport function was used as an assay for cDNA species coding for that transporter . After separation , it was realized that there were many similarities between the two DNA sequences . Further exploration in the field of reuptake proteins found that many of the transporters associated with important neurotransmitters within the body were also very similar in sequence to the GABA and norepinephrine transporters . The members of this new family include transporters for dopamine , norepinephrine , serotonin , glycine , proline and GABA . They were called Na / Cl dependent neurotransmitter transporters . Sodium and Chloride ion dependence will be discussed later in the mechanism of action . Using the commonalities among sequences and hydropathy plot analyses , it was predicted that there are 12 hydrophobic membrane spanning regions in the ' Classical ' transporter family . In addition to this , the N - and C - termini exist in the intracellular space . These proteins also all have an extended extracellular loop between the third and fourth transmembrane sequences . Site - directed chemical labeling experiments verified the predicted topological organization of the serotonin transporter .