MSP2(P44) hypervariable-region sequences from the predominant variants present in the rickettsemic peaks from sheep 4203 and 4210. Shown is a MUSCLE/CHROMA alignment of the sequence variants present at each sampling time analyzed here (Fig. 1) from lamb 4203 (variants 1) and lamb 4210 (variants 2). That is, variants 1.1 through 1.5 represent the variants present in lamb 4203 at sampling times of 8, 29, 50, 69, and 93 days p.i. and variants 2.1 through 2.4 represent the variants present in lamb 4210 at sampling times of 8, 41, 55, and 79 days p.i. The percentage of a variant in each sampled population is given next to the variant number designation. Identical variants that are present in different populations are indicated by the same superscript letter to the right, except for the two variants indicated by a superscript e. These variants (1.2 and 2.3) are identical except for a short region of difference that is highlighted in red. A consensus sequence for all variants is shown at the bottom, where lowercase letters indicate the following: b, big (EFHIKLMQRWY); c, charged (DEHKR); h, hydrophobic (ACFGHILMTVWY); p, polar (CDEHKNQRST); s, small (ACDGNPSTV); t, tiny (AGS).