Des enveloppes

Des enveloppes Source google image: https://www.researchgate.net/profile/Mathilde_Gendrin/publication/282194103/figure/fig4/AS:560674577567744@1510686644861/Structures-des-enveloppes-bacteriennes-A-Lenveloppe-des-bacteries-a-Gram-positif-est.png