SRS15826419 SAMN31823600 small RNA 78630 Betula platyphylla bioproject 902946 isolate not collected cultivar not collected ecotype not collected age 33 years geo_loc_name China:Shulan tissue leaf BioSampleModel Plant SRS15826420 SAMN31823602 small RNA 78630 Betula platyphylla bioproject 902946 isolate not collected cultivar not collected ecotype not collected age 28 years geo_loc_name China:Amuer tissue leaf BioSampleModel Plant SRS15826421 SAMN31823603 small RNA 78630 Betula platyphylla bioproject 902946 isolate not collected cultivar not collected ecotype not collected age 25 years geo_loc_name China:Alihe tissue leaf BioSampleModel Plant SRS15826488 SAMN31823601 small RNA 78630 Betula platyphylla bioproject 902946 isolate not collected cultivar not collected ecotype not collected age 23 years geo_loc_name China:Fenghuangshan tissue leaf BioSampleModel Plant