 Many ligand transport proteins bind particular small biomolecules and transport them to other locations in the body of a multicellular organism . These proteins must have a high binding affinity when their ligand is present in high concentrations , but must also release the ligand when it is present at low concentrations in the target tissues . The canonical example of a ligand @-@ binding protein is haemoglobin , which transports oxygen from the lungs to other organs and tissues in all vertebrates and has close homologs in every biological kingdom . Lectins are sugar @-@ binding proteins which are highly specific for their sugar moieties . Lectins typically play a role in biological recognition phenomena involving cells and proteins . Receptors and hormones are highly specific binding proteins . 
 Many ligand transport proteins bind particular small biomolecules and transport them to other locations in the body of a multicellular organism . These proteins must have a high binding affinity when their ligand <a href='drop_aux' title='1'><mark>is</mark></a>present in high concentrations , but must also release the ligand when it <a href='drop_aux' title='2'><mark>is</mark></a>present at low concentrations in the target tissues . The canonical example of a ligand @-@ binding protein <a href='drop_aux' title='3'><mark>is</mark></a>haemoglobin , which <a href='uninflect' title='4'><mark>transports</mark></a> oxygen from the lungs to other organs and tissues in all vertebrates and <a href='got' title='5'><mark>has</mark></a> close homologs in every biological kingdom . Lectins <a href='drop_aux' title='6'><mark>are</mark></a>sugar @-@ binding proteins which <a href='drop_aux' title='7'><mark>are</mark></a>highly specific for their sugar moieties . Lectins typically play a role in biological recognition phenomena involving cells and proteins . Receptors and hormones <a href='drop_aux' title='8'><mark>are</mark></a>highly specific binding proteins . 
Many ligand transport proteins bind particular small biomolecules and transport em to other locations in da body of a multicellular organism . dese proteins must have a high binding affinity when their ligand present in high concentrations , but must also release the ligand when it present at low concentrations in the target tissues . The canonical example of a ligand @-@ binding protein haemoglobin , which transport oxygen from tdalungs to other organs and tissues in all vertebrates and got close homologs in every biological kingdom . Lectins sugar @-@ binding proteins which highly specific fir their sugar moieties . Lectins typically play a role in biological recognition phenomena involving cells and proteins . Receptors and hormones highly specific binding proteins .