"Blood vessel formation when new vessels emerge from the proliferation of pre-existing blood vessels [goid 1525] [evidence IEA]; Any process involved in the conversion of one or more primary RNA transcripts into one or more mature RNA molecules [goid 6396] [evidence IEA]; The process by which an organism retains a population of stem cells, preventing the commitment of all stem cell progeny to a differentiated cell fate [goid 19827] [evidence IEA]; The process whose specific outcome is the progression of the lung over time, from its formation to the mature structure. In all air-breathing vertebrates the lungs are developed from the ventral wall of the oesophagus as a pouch which divides into two sacs. In amphibians and many reptiles the lungs retain very nearly this primitive sac-like character, but in the higher forms the connection with the oesophagus becomes elongated into the windpipe and the inner walls of the sacs become more and more divided, until, in the mammals, the air spaces become minutely divided into tubes ending in small air cells, in the walls of which the blood circulates in a fine network of capillaries. In mammals the lungs are more or less divided into lobes, and each lung occupies a separate cavity in the thorax [goid 30324] [evidence IEA]; Cleavage of double-stranded RNA to form small interfering RNA molecules (siRNAs) of 21-23 nucleotides [goid 30422] [evidence IEA]; The process by which small interfering RNAs target cognate mRNA molecules for degradation [goid 30423] [pmid 12560494] [evidence IEP]; Any process by which RNA molecules inactivate expression of target genes [goid 31047] [evidence IEA]; The process, occurring in the embryo, by which the anatomical structures of the hindlimbs are generated and organized. Morphogenesis pertains to the creation of form. The hindlimbs are the posterior limbs of an animal [goid 35116] [evidence IEA]; Cleavage of stem-loop RNA precursors into microRNAs (miRNAs), a class of small RNAs that primarily silence genes by blocking the translation of mRNA transcripts into protein [goid 35196] [evidence IEA]; The process by which the anatomical structures of branches in a tube are generated and organized. Morphogenesis pertains to the creation of form. A tube is a long hollow cylinder [goid 48754] [evidence IEA]"