Silk purse or sow's ear.
Allan
J
J
D000818:Animals; D002478:Cells, Cultured; D017988:Gammaretrovirus / Q000302:isolation & purification*; D006801:Humans; D007668:Kidney / Q000821:virology; D016377:Organ Transplantation / Q000009:adverse effects*; D012192:Retroviridae Infections / Q000209:etiology*; D013552:Swine; D014183:Transplantation, Heterologous; D014412:Tumor Virus Infections / Q000209:etiology*