node.nearest.php

    $skeleton_rows = $db->getResult(
	"SELECT class_instance_a as skeleton_id
	FROM class_instance_class_instance cici,
	     class_instance ca,
	     class_instance cb
	WHERE relation_id = {$relations['model_of']}
	AND class_instance_b = $neuronID
	AND cici.class_instance_a = ca.id
	AND cici.class_instance_b = cb.id
	AND ca.class_id = {$classes['skeleton']}
	AND cb.class_id = {$classes['neuron']}");