Light micrographs of developmental stages of Babesia sp. (EU1) from in vitro culture (May-Grünwald Giemsa based stain). The first two lines show C201 isolate cultured in roe deer red blood cells. Free merozoites, trophozoites, dividing forms and small geminate merozoites at the border of the erythrocyte membrane are very similar to B. capreoli in roe deer erythrocytes or B. divergens in bovine erythrocytes. The last line shows geminate merozoites of the C201 clone in sheep erythrocytes; morphological aspects are very similar, but geminate forms appear more variable in shape and localization.