 Similar to Cajal bodies are Gemini of Cajal bodies , or gems , whose name is derived from the Gemini constellation in reference to their close " twin " relationship with CBs . Gems are similar in size and shape to CBs , and in fact are virtually indistinguishable under the microscope . Unlike CBs , gems do not contain small nuclear ribonucleoproteins ( snRNPs ) , but do contain a protein called survival of motor neuron ( SMN ) whose function relates to snRNP biogenesis . Gems are believed to assist CBs in snRNP biogenesis , though it has also been suggested from microscopy evidence that CBs and gems are different manifestations of the same structure . Later ultrastructural studies have shown gems to be twins of Cajal bodies with the difference being in the coilin component ; Cajal bodies are SMN positive and coilin positive , and gems are SMN positive and coilin negative . 
 Similar to Cajal bodies <a href='drop_aux' title='1'><mark>are</mark></a>Gemini of Cajal bodies , or gems , whose name is derived from the Gemini constellation in reference to their close " twin " relationship with CBs . Gems <a href='drop_aux' title='2'><mark>are</mark></a>similar in size and shape to CBs , and in fact <a href='drop_aux' title='3'><mark>are</mark></a>virtually indistinguishable under the microscope . Unlike <a href='negative_concord' title='4'><mark>CBs</mark></a> , gems do not contain small nuclear ribonucleoproteins ( snRNPs ) , but do contain a protein called survival of motor neuron ( SMN ) whose function <a href='uninflect' title='5'><mark>relates</mark></a> to snRNP biogenesis . Gems are believed to assist CBs in snRNP biogenesis , though it <a href='been_done' title='6'><mark>has</mark></a> also been suggested from microscopy evidence that CBs and gems <a href='drop_aux' title='7'><mark>are</mark></a>different manifestations of the same structure . Later ultrastructural studies <a href='been_done' title='8'><mark>have</mark></a> shown gems to be twins of Cajal bodies with the difference being in the coilin component ; Cajal bodies are SMN positive and coilin positive , and gems <a href='drop_aux' title='9'><mark>are</mark></a>SMN positive and coilin negative . 
Similar to Cajal bodies Gemini of Cajal bodies , or gems , whose name is derived from the Gemini constellation in reference to their close " twin " relationship with CBs . Gems similar in size and shape to CBs , and in fact virtually indistinguishable under da microscope . Unlike No CBs , gems do not contain small nuclear ribonucleoproteins ( snRNPs ) , but do contain a protein called survival of motor neuron ( SMN ) whose function relate to snRNP biogenesis . Gems are believed to assist CBs in snRNP biogenesis , though it done also been suggested from microscopy evidence dat CBs and gems different manifestations of tdasame structure . Later ultrastructural studies done shown gems to be twins of Cajal bodies wid thdaifference being in the coilin component ; Cajal bodies are SMN positive and coilin positive , and gems SMN positive and coilin negative .